Modified Borg Dyspnea Scale (MBS): Scoring and Clinical Use

The Modified Borg Dyspnea Scale (MBS) is a simple clinical tool used to measure how much breathing difficulty a patient feels at a specific moment. It allows patients to rate their shortness of breath using a numbered scale supported by verbal descriptions.

Because dyspnea is subjective, it cannot be measured fully through respiratory rate, oxygen saturation, or physical appearance alone.

The scale adds the patient’s personal experience to the clinical assessment and is commonly used during exercise testing, pulmonary rehabilitation, bedside evaluation, and treatment monitoring.

What Is the Modified Borg Dyspnea Scale?

The Modified Borg Dyspnea Scale (MBS) is a numerical rating system that helps patients communicate the intensity of breathing discomfort. It is often used by respiratory therapists, nurses, physicians, physical therapists, and pulmonary rehabilitation specialists.

The scale typically ranges from 0 to 10. A score of 0 means that the patient is experiencing no breathing difficulty, while a score of 10 represents the most severe breathlessness the patient can imagine. Several numbers are paired with descriptive terms that help the patient choose the rating that most closely matches the current sensation.

The scale is modified from the original Borg Rating of Perceived Exertion Scale, which was designed to measure overall physical effort during exercise. The modified version focuses more specifically on symptoms such as dyspnea and fatigue.

The Modified Borg Scale does not measure lung function directly. It does not determine airflow, lung volume, oxygen concentration, respiratory muscle strength, or gas exchange. Instead, it documents the patient’s perceived intensity of breathing discomfort.

This distinction is important because dyspnea is a personal experience. Two patients with similar oxygen saturation values, respiratory rates, or pulmonary function test results may report very different levels of shortness of breath.

Understanding Dyspnea

Dyspnea is the medical term for an uncomfortable or difficult sensation associated with breathing. Patients may describe it in many different ways, including:

• Shortness of breath
• Difficulty breathing
• Air hunger
• Chest tightness
• Labored breathing
• An inability to take a deep breath
• An inability to get enough air
• Excessive effort required to breathe
• A feeling of suffocation
• An inability to empty the lungs

These descriptions may reflect different physiologic mechanisms. One patient may experience air hunger because the body is signaling a greater need for ventilation. Another may feel excessive breathing effort because the respiratory muscles are working against airway obstruction or stiff lungs.

Dyspnea can occur in healthy people during strenuous physical activity. It becomes clinically concerning when it occurs at rest, during mild exertion, or during activities that previously caused no difficulty.

Dyspnea Is a Subjective Symptom

A symptom is something experienced and reported by the patient. A sign is something that can be observed or measured by another person.

Dyspnea is primarily a symptom. It cannot be measured fully by looking at the patient. A clinician may observe an increased respiratory rate, accessory muscle use, nasal flaring, retractions, or difficulty speaking, but these signs do not reveal exactly how the patient feels.

A patient may appear calm while experiencing significant breathlessness. Another patient may breathe rapidly and appear distressed while reporting only moderate discomfort.

This is why direct questioning is necessary. The clinician must ask the patient to describe the sensation and estimate its severity.

Modified Borg Dyspnea Scale Ratings

The Modified Borg Scale generally includes the following ratings:

• 0: No breathing difficulty
• 0.5: Very, very slight breathing difficulty, just noticeable
• 1: Very slight breathing difficulty
• 2: Slight breathing difficulty
• 3: Moderate breathing difficulty
• 4: Somewhat severe breathing difficulty
• 5: Severe breathing difficulty
• 6: Severe breathing difficulty
• 7: Very severe breathing difficulty
• 8: Very, very severe breathing difficulty
• 9: Extremely severe breathing difficulty
• 10: Maximal breathing difficulty

The exact wording may vary slightly depending on the version of the scale being used. Some clinical settings begin at 0, while others present a 1-to-10 format during specific exercise tests. The key is to use the same version consistently so that scores can be compared over time.

The verbal descriptions serve as anchors. A patient who is unsure whether to choose 3 or 4 can compare the terms “moderate” and “somewhat severe” and decide which better represents the current sensation.

How the Scale Works

The clinician presents the scale to the patient and asks for the number that best describes the current level of breathing difficulty.

The patient should be able to see the full scale, including both the numbers and the verbal descriptions. The clinician should provide clear instructions but should not suggest a response.

A neutral instruction may be phrased as follows:

“Please look at this scale and select the number that best describes how difficult your breathing feels right now.”

The rating should represent breathing discomfort rather than general tiredness, leg fatigue, pain, dizziness, or emotional stress alone.

If the patient is completing an exercise test, the clinician may ask for separate ratings of dyspnea and leg fatigue. This helps distinguish respiratory limitation from muscle discomfort.

The Clinician Should Not Assign the Score

The Borg rating must come from the patient whenever possible. A clinician should not select a number based only on respiratory rate, facial expression, or physical appearance.

For example, a patient may have an oxygen saturation of 95%, a respiratory rate of 20 breaths per minute, and no obvious accessory muscle use, yet still report a Borg score of 6. That score is clinically meaningful because it reflects the patient’s conscious experience.

Similarly, a patient may have an oxygen saturation of 86% but report only mild dyspnea. This does not make the oxygen desaturation less important. It simply shows that physiologic impairment and symptom perception do not always change together.

Why Patients Experience Dyspnea Differently

The sensation of breathing difficulty is produced by a complex interaction between the lungs, respiratory muscles, nervous system, cardiovascular system, and brain.

Several factors can influence how a patient experiences dyspnea.

Respiratory Drive

The brainstem respiratory centers regulate breathing based on signals related to carbon dioxide, oxygen, pH, exercise, and metabolic activity.

When carbon dioxide rises, oxygen falls, or the blood becomes more acidic, the body may increase the drive to breathe. The patient may experience this increased respiratory demand as air hunger or an urgent need to breathe.

Respiratory Muscle Effort

Breathing may feel difficult when the respiratory muscles must work harder than normal.

In obstructive lung disease, the patient may need to generate greater pressure to move air through narrowed airways. In restrictive lung disease, the lungs or chest wall may resist expansion. In neuromuscular disease, weak respiratory muscles may struggle to produce an adequate breath.

The increased effort can create a sensation of labored breathing even when oxygen saturation remains acceptable.

Neuromechanical Dissociation

Neuromechanical dissociation occurs when the respiratory system generates a strong effort to breathe but produces less ventilation or chest movement than expected.

The patient may feel that the breathing muscles are working very hard, yet each breath remains small or unsatisfying. This mismatch can produce intense dyspnea.

It may occur with:

• Severe airflow obstruction
• Dynamic hyperinflation
• Restrictive lung disease
• Respiratory muscle weakness
• Increased elastic resistance
• Reduced chest wall movement

Note: The stronger the respiratory drive becomes without a corresponding increase in ventilation, the more uncomfortable breathing may feel.

Emotional Response

Fear, anxiety, uncertainty, and loss of control can intensify dyspnea.

A healthy person who becomes breathless while running usually understands the cause and expects the sensation to improve after stopping. A patient with cardiopulmonary disease may become short of breath during bathing, dressing, or resting. The unexpected nature of the symptom may create fear.

Fear can increase respiratory rate and muscle tension. This may worsen the sensation of breathing difficulty and create a cycle in which dyspnea increases anxiety and anxiety further increases dyspnea.

The Modified Borg Scale does not separate the physical and emotional components of breathlessness. It measures the total intensity perceived by the patient.

Common Causes of Dyspnea

The Borg Scale does not identify why a patient is short of breath. It only measures how severe the symptom feels.

Dyspnea may result from many conditions, including:

• Asthma
• Chronic obstructive pulmonary disease
• Pneumonia
• Pulmonary edema
• Interstitial lung disease
• Pulmonary embolism
• Pleural disease
• Pneumothorax
• Heart failure
• Cardiac ischemia
• Anemia
• Metabolic acidosis
• Obesity
• Neuromuscular weakness
• Respiratory muscle fatigue
• Physical deconditioning
• Anxiety or panic
• Upper airway obstruction
• Pulmonary hypertension
• Lung cancer

Note: A complete assessment is required to determine the cause. The Borg score is one part of that evaluation.

The Language Patients Use to Describe Dyspnea

The words a patient chooses may offer clues about the underlying mechanism.

• A patient who says, “I cannot get enough air,” may be describing air hunger. This sensation can occur when respiratory drive is increased by hypoxemia, hypercapnia, acidosis, or exercise.
• A patient who says, “I cannot take a deep breath,” may be experiencing restricted lung expansion, hyperinflation, chest wall discomfort, or heightened awareness of breathing.
• A patient who says, “I cannot get the air out,” may be describing expiratory flow limitation. This is common in obstructive lung disorders such as asthma and chronic obstructive pulmonary disease.
• A patient who reports chest tightness may have bronchoconstriction, especially if the symptom occurs with wheezing, coughing, or a known history of asthma.

Note: Patients with interstitial lung disease may describe rapid breathing, gasping, or excessive effort because stiff lung tissue makes expansion more difficult. These descriptions should be documented along with the numerical score.

Using the Scale During a Patient Assessment

The Modified Borg Scale can be used during routine bedside assessment to establish a baseline.

The clinician may ask the patient to rate dyspnea:

• At rest
• While sitting
• While lying flat
• During conversation
• After repositioning
• During ambulation
• During bathing or dressing
• After climbing stairs
• Before and after respiratory therapy
• During rehabilitation exercise

Note: The score should be recorded with the activity and conditions under which it was obtained. A Borg score of 4 while resting has a different clinical meaning than a score of 4 after walking several hundred feet. Context is necessary for interpretation.

Questions to Ask About Dyspnea

The clinician should gather information beyond the Borg score. Important questions include:

• When did the breathing difficulty begin?
• Did it begin suddenly or gradually?
• Is it present at rest?
• What activities cause it?
• How far can the patient walk before stopping?
• How many stairs can the patient climb?
• Is the symptom worse when lying flat?
• Does it improve when sitting upright?
• Does it occur at a certain time of day?
• Does it worsen after meals?
• Is it associated with coughing, wheezing, fever, chest pain, or swelling?
• Does oxygen or medication improve it?
• How long does recovery take after activity stops?

Note: These questions help define the pattern and possible cause of the symptom.

The Modified Borg Scale and the Six-Minute Walk Test

One of the most common uses of the Modified Borg Dyspnea Scale is during the six-minute walk test.

The six-minute walk test measures the distance a patient can walk on a flat surface during a six-minute period. It provides a practical estimate of functional exercise capacity.

The test is often used in patients with chronic cardiopulmonary disease and in pulmonary rehabilitation programs. It resembles a common activity of daily living and is easier to perform than a full cardiopulmonary exercise test.

Baseline Assessment Before the Walk

Before the test begins, the clinician should obtain baseline measurements. These may include:

• Heart rate
• Respiratory rate
• Blood pressure
• Oxygen saturation
• Oxygen flow rate
• Borg dyspnea rating
• Borg fatigue rating
• Any symptoms present at rest

The patient should be allowed to sit and rest before testing. Prescribed preexercise medications should generally be taken as directed. If the patient normally uses oxygen during activity, the prescribed oxygen system should be used unless the test protocol specifies otherwise.

Note: The baseline Borg rating provides a reference point for interpreting the patient’s response to exercise.

Instructions During the Test

The patient is instructed to walk as far as possible during six minutes. The patient may slow down or stop to rest but should resume walking when able. Standardized instructions and encouragement should be used. Excessive coaching can affect performance and make repeat testing less reliable.

The clinician monitors the patient’s general appearance, gait, symptoms, and oxygen saturation. Depending on the setting, the clinician may walk near the patient or remain at a designated location along the course.

Monitoring Dyspnea During the Walk

The Borg Scale may be used before, during, and immediately after the test. During the test, a rising score indicates that the activity is increasing the patient’s perceived breathing difficulty. The score should be interpreted together with objective data.

For example:

• A rising Borg score with stable oxygen saturation may suggest increased work of breathing, ventilatory limitation, or deconditioning.
• A rising Borg score with oxygen desaturation may suggest gas exchange impairment during exercise.
• A low Borg score with severe leg fatigue may indicate that the walking limitation is not primarily respiratory.
• A high Borg score with a short walking distance may indicate substantial symptom burden.

Note: The patient should not be pressured to continue if breathing becomes intolerable.

Post-Test Assessment

Immediately after six minutes, the patient stops at the current location. The total distance is recorded.

The clinician then reassesses:

• Heart rate
• Respiratory rate
• Blood pressure when indicated
• Oxygen saturation
• Borg dyspnea rating
• Borg fatigue rating
• Reason for stopping or slowing
• Presence of chest pain, dizziness, weakness, or other symptoms

The pretest and post-test Borg scores are compared. A patient who begins at 1 and ends at 5 has moved from very slight to severe dyspnea. Another patient may begin at 3 and end at 4, showing only a modest increase despite beginning with moderate symptoms.

Note: Both the absolute scores and the amount of change are useful.

Reasons to Stop Exercise Testing

A six-minute walk test or rehabilitation exercise session may need to be stopped when concerning symptoms or signs develop.

Potential reasons include:

• Chest pain
• Intolerable dyspnea
• Severe dizziness
• Near-syncope or fainting
• Loss of coordination
• Marked weakness
• Pale or ashen appearance
• Confusion
• Severe wheezing
• Leg cramps or significant pain
• Abnormal blood pressure response
• Serious cardiac rhythm changes
• Significant oxygen desaturation
• The patient requests to stop

A high Borg rating may contribute to the decision, but it should not be the only factor considered.

Some facilities use specific oxygen saturation stopping criteria. These may vary based on the patient, the purpose of the test, and the orders of the supervising clinician. The patient’s overall clinical condition remains the priority.

The Learning Effect During Walk Testing

Patients often perform better during a second six-minute walk test because they have become familiar with the procedure. This is called the learning effect or practice effect.

During the first test, the patient may be uncertain about pacing, hallway turns, instructions, or how much effort is expected. During the second test, the patient may walk more efficiently and cover a greater distance.

For this reason, more than one test may be performed when accurate baseline measurement is important. The patient should be given an adequate rest period between tests.

The Borg Scale can help show whether improved distance is associated with greater symptom intensity or better exercise efficiency. For example, a patient may walk farther on the second test while reporting the same post-test Borg score. This suggests improved performance without an increase in perceived dyspnea.

Use in Pulmonary Rehabilitation

The Modified Borg Scale is widely used in pulmonary rehabilitation.

Pulmonary rehabilitation is designed for patients with chronic respiratory disease who experience exercise limitation, dyspnea, reduced independence, or impaired quality of life.

Programs often include:

• Aerobic exercise
• Strength training
• Breathing retraining
• Education
• Airway clearance instruction
• Medication education
• Oxygen assessment
• Energy conservation techniques
• Nutritional guidance
• Psychosocial support

Note: Borg ratings may be collected during walking, cycling, stair climbing, or resistance exercise.

Establishing Exercise Intensity

The Borg score can help clinicians judge whether exercise intensity is appropriate.

A patient should be challenged enough to produce a training effect but not pushed to the point of unsafe or intolerable symptoms. The desired intensity depends on the patient’s condition, rehabilitation goals, and clinical stability.

A moderate Borg rating during exercise may be acceptable for many patients, but the target should be individualized.

The score should be considered along with:

• Oxygen saturation
• Heart rate
• Blood pressure
• Respiratory pattern
• Exercise duration
• Workload
• Symptoms
• Recovery time

Measuring Improvement

A lower Borg score is not the only sign of progress.

A patient may improve by:

• Walking farther at the same Borg rating
• Exercising longer at the same Borg rating
• Using a higher workload with the same symptom intensity
• Recovering more quickly after exercise
• Reporting less dyspnea during daily activities
• Requiring fewer rest periods
• Completing tasks with greater independence

For example, a patient may initially walk 500 feet and report a post-test Borg score of 5. After several weeks of rehabilitation, the patient may walk 800 feet and still report a score of 5. The symptom rating has not changed, but the patient can perform substantially more work before reaching the same level of dyspnea.

Use Before and After Treatment

The Modified Borg Scale can be used to evaluate how a patient responds to an intervention.

A rating may be obtained before and after:

• Bronchodilator therapy
• Oxygen therapy
• Airway clearance
• Suctioning
• Positioning
• Breathing exercises
• Pulmonary rehabilitation
• Ambulation
• Noninvasive ventilation
• Relaxation training
• Secretion mobilization

A lower rating after treatment may indicate that the patient feels less breathing discomfort. However, the score must be interpreted carefully. A symptom improvement does not always mean that the underlying physiologic problem has resolved.

For example, oxygen therapy may improve saturation without changing dyspnea. A bronchodilator may reduce chest tightness and breathing effort while oxygen saturation remains unchanged. Both responses can be clinically meaningful.

Relationship Between Borg Scores and Oxygen Saturation

Borg scores and oxygen saturation measure different aspects of respiratory status.

Pulse oximetry estimates arterial oxygen saturation. The Borg Scale measures perceived breathing difficulty.

A patient can have:

• Normal oxygen saturation with severe dyspnea
• Low oxygen saturation with mild dyspnea
• Severe dyspnea and severe desaturation
• Minimal dyspnea and stable saturation

Normal oxygen saturation does not rule out important respiratory problems. Dyspnea can result from airflow obstruction, hyperinflation, acidosis, respiratory muscle weakness, cardiac dysfunction, or anxiety without immediate hypoxemia.

Likewise, some patients with chronic hypoxemia may not perceive intense breathlessness. The two measurements should be used together rather than treated as interchangeable.

Relationship Between Borg Scores and Respiratory Rate

Respiratory rate is an objective measurement, while the Borg score is subjective. A rapid respiratory rate may indicate respiratory distress, fever, metabolic acidosis, pain, anxiety, hypoxemia, or exercise response. However, the rate does not show how uncomfortable breathing feels.

Some patients develop significant dyspnea before the respiratory rate rises. Others breathe rapidly but do not report severe discomfort. The clinician should document both measurements and evaluate how they change together.

Standardizing Use of the Scale

Consistency improves the value of Borg ratings. When the scale is used repeatedly, clinicians should try to maintain similar conditions.

Important factors include:

• Using the same version of the scale
• Showing the full scale to the patient
• Giving the same instructions
• Using neutral language
• Recording the activity being performed
• Documenting oxygen use and flow rate
• Recording the patient’s position
• Measuring at similar time points
• Avoiding suggestions about what the score should be

Note: During exercise testing, additional factors should remain consistent, including the hallway, walking aid, oxygen system, encouragement, and test duration. Without standardization, changes in the score may reflect differences in test conditions rather than changes in the patient.

Documentation

Borg ratings should be documented with enough detail to make the score meaningful.

Documentation may include:

• Borg score at rest
• Borg score during activity
• Borg score after activity
• Type and duration of activity
• Oxygen delivery system
• Oxygen flow rate
• Oxygen saturation
• Heart rate
• Respiratory rate
• Distance walked
• Number and duration of rest periods
• Symptoms that limited activity
• Treatment provided
• Response to treatment
• Time required for recovery

Note: A note that only states “Borg score 5” provides limited information. It is more useful to document that the patient reported a Borg dyspnea score of 5 after walking 400 feet on 2 L/min of oxygen, with oxygen saturation decreasing from 94% to 89%.

Advantages of the Modified Borg Scale

The scale has several practical advantages.

• It Is Simple: The patient can usually select a number within seconds. No laboratory equipment or invasive procedure is required.
• It Is Inexpensive: The scale can be printed, displayed on a card, or incorporated into an electronic chart.
• It Can Be Repeated Frequently: Ratings can be obtained before, during, and after activity without interrupting care for long periods.
• It Captures the Patient’s Perspective: Objective measurements do not fully describe how breathing feels. The Borg Scale provides information directly from the patient.
• It Supports Trend Monitoring: Repeated scores can show whether symptoms are improving, worsening, or remaining stable.
• It Can Be Used in Many Settings: The scale can be used at the bedside, during rehabilitation, in outpatient clinics, during walk testing, and during routine activities.

Limitations of the Modified Borg Scale

The scale also has limitations.

• It Depends on Patient Understanding: The patient must understand the instructions and the relationship between the numbers and verbal descriptions. Confusion, cognitive impairment, severe distress, developmental limitations, or language barriers may reduce reliability.
• It Depends on Communication: The patient must be able to communicate a rating verbally, visually, or through another reliable method. Intubated patients, heavily sedated patients, and patients with severe neurologic impairment may not be able to use the scale accurately.
• Ratings Vary Between Patients: One patient’s score of 5 may not represent exactly the same sensation as another patient’s score of 5. The scale is often most useful for comparing a patient with their own previous scores rather than comparing different patients directly.
• Emotional Factors Can Affect the Score: Anxiety, fear, mood, expectations, and previous experiences can influence symptom perception. This does not make the score invalid. It means the score reflects the patient’s total experience rather than one isolated physiologic variable.
• It Does Not Identify the Cause: A high Borg score confirms severe perceived dyspnea but does not determine whether the cause is pulmonary, cardiac, metabolic, neuromuscular, or psychological. Further assessment is required.
• It Should Not Replace Objective Monitoring: The scale cannot replace pulse oximetry, physical examination, vital signs, electrocardiographic monitoring, arterial blood gas testing, pulmonary function testing, or other diagnostic procedures.

Patients Who May Have Difficulty Using the Scale

Some patients may need additional instruction or an alternative assessment method.

Challenges may occur in patients with:

• Cognitive impairment
• Delirium
• Dementia
• Severe developmental disability
• Language barriers
• Visual impairment
• Severe hearing impairment
• Extreme respiratory distress
• Reduced level of consciousness
• Neurologic injury
• Limited ability to understand numerical concepts

Note: A translated or visually adapted scale may help in some situations. An interpreter may also be necessary. When the scale cannot be used reliably, clinicians must rely more heavily on observable signs, physiologic measurements, caregiver reports, and other validated tools.

Interpreting Changes Over Time

A single Borg score describes one moment. A pattern of scores is usually more useful.

Repeated measurements can show:

• Worsening symptoms at rest
• Increased dyspnea with the same activity
• Improved tolerance after treatment
• Better exercise capacity during rehabilitation
• Slower recovery after exertion
• Greater need for oxygen
• Progression of cardiopulmonary disease

The clinician should examine both the score and the conditions under which it was obtained.

A change from 2 to 5 during the same walking task may indicate worsening exercise tolerance. However, a change from 2 to 5 during a much more demanding activity may be expected. Clinical interpretation requires context.

Role in Chronic Obstructive Pulmonary Disease

The Modified Borg Scale is especially useful in chronic obstructive pulmonary disease. Patients with COPD may experience airflow obstruction, air trapping, hyperinflation, increased work of breathing, and reduced exercise tolerance.

During activity, the patient may begin the next breath before fully exhaling the previous one. This can increase lung volume and make inhalation more difficult. The patient may describe an inability to get a deep breath or empty the lungs.

Dyspnea often causes patients to avoid activity. Over time, inactivity leads to muscle deconditioning. Deconditioned muscles require more energy for ordinary tasks, which increases ventilatory demand and worsens breathlessness.

Note: The Borg Scale helps quantify this symptom burden and evaluate improvement during rehabilitation.

Role in Interstitial Lung Disease

Patients with interstitial lung disease may experience stiff lungs, rapid shallow breathing, impaired gas exchange, and exercise-related oxygen desaturation. Dyspnea may be minimal at rest but severe during walking or climbing stairs.

Borg ratings can help document the relationship between symptoms, activity, and oxygen saturation. They are also useful when evaluating the effect of supplemental oxygen and rehabilitation.

Role in Cardiac Disease

Heart failure, pulmonary hypertension, ischemic heart disease, and other cardiovascular disorders can cause exertional dyspnea. A patient may become breathless because cardiac output cannot increase adequately during activity, pulmonary pressures rise, or fluid accumulates in the lungs.

The Borg Scale can document symptom intensity, but it cannot determine whether the limitation is cardiac or pulmonary. Additional testing may be required.

Role in Anxiety and Panic

Anxiety and panic can produce or intensify breathing discomfort. Patients may report chest tightness, air hunger, rapid breathing, tingling, dizziness, or an inability to take a satisfying breath.

A high Borg score should not automatically be attributed to anxiety. Serious pulmonary and cardiac causes must be considered first when appropriate.

Once dangerous causes have been evaluated, the scale may help monitor the response to breathing control, reassurance, relaxation, and treatment of the underlying anxiety disorder.

Difference Between Dyspnea and General Exertion

Dyspnea is not the same as overall exertion. A patient may feel physically exhausted because of leg fatigue while experiencing only mild breathing difficulty. Another patient may have minimal muscle fatigue but severe shortness of breath.

During exercise assessment, it is helpful to ask separately about:

• Dyspnea
• Leg fatigue
• General exertion
• Chest discomfort
• Dizziness
• Pain

Note: Separating these symptoms provides a clearer understanding of what limits activity.

Clinical Example

Consider a patient with COPD participating in a six-minute walk test.

Before the test, the patient has:

• Oxygen saturation of 94%
• Heart rate of 82 beats per minute
• Borg dyspnea score of 1
• No leg fatigue

After six minutes, the patient has:

• Oxygen saturation of 88%
• Heart rate of 118 beats per minute
• Borg dyspnea score of 6
• Moderate leg fatigue
• One brief rest period

This information shows that the patient experienced a substantial increase in breathing discomfort, developed exercise-related desaturation, and required a rest period.

After several weeks of pulmonary rehabilitation, the patient repeats the test and walks farther. The post-test Borg score remains 6, but oxygen saturation falls only to 91%, and no rest period is required.

Although the final dyspnea score is unchanged, the patient demonstrates improved functional capacity, better oxygenation, and greater endurance.

Practical Tips for Clinicians

To use the Modified Borg Dyspnea Scale effectively:

• Explain the scale before testing or treatment begins.
• Make sure the patient can see all numbers and descriptions.
• Ask specifically about breathing difficulty.
• Avoid leading the patient toward a certain number.
• Record the patient’s position and activity.
• Document oxygen use and flow rate.
• Pair the score with objective measurements.
• Use the same instructions during repeat assessments.
• Evaluate trends rather than relying on one score.
• Stop activity when symptoms become unsafe or intolerable.

Modified Borg Dyspnea Scale Practice Questions

1. What is the Modified Borg Dyspnea Scale?
The Modified Borg Dyspnea Scale is a clinical tool used to measure a patient’s subjective perception of breathing difficulty.

2. What does the Modified Borg Dyspnea Scale measure?
It measures how difficult or uncomfortable breathing feels to the patient at a particular moment.

3. Why is the Modified Borg Dyspnea Scale considered a subjective measurement?
It is subjective because the score is based on the patient’s personal experience of breathing discomfort rather than an objective test result.

4. What is dyspnea?
Dyspnea is the uncomfortable sensation of difficult, labored, or unpleasant breathing.

5. How may patients commonly describe dyspnea?
Patients may describe dyspnea as shortness of breath, air hunger, chest tightness, difficulty breathing, or an inability to get enough air.

6. Why can dyspnea not be measured accurately through observation alone?
A patient’s respiratory rate, oxygen saturation, breathing pattern, and appearance may not match the actual intensity of breathing discomfort being experienced.

7. What is the standard numerical range of the Modified Borg Dyspnea Scale?
The standard scale ranges from 0 to 10.

8. What does a score of 0 represent on the Modified Borg Dyspnea Scale?
A score of 0 represents no breathing difficulty at all.

9. What does a score of 0.5 represent on the Modified Borg Dyspnea Scale?
A score of 0.5 represents very, very slight dyspnea that is only just noticeable.

10. What does a score of 1 represent on the Modified Borg Dyspnea Scale?
A score of 1 represents very slight breathing difficulty.

11. What does a score of 2 represent on the Modified Borg Dyspnea Scale?
A score of 2 represents slight breathing difficulty.

12. What does a score of 3 represent on the Modified Borg Dyspnea Scale?
A score of 3 represents moderate breathing difficulty.

13. What does a score of 4 represent on the Modified Borg Dyspnea Scale?
A score of 4 represents somewhat severe breathing difficulty.

14. What does a score of 5 represent on the Modified Borg Dyspnea Scale?
A score of 5 represents severe breathing difficulty.

15. What do scores of 6 and 7 generally represent on the Modified Borg Dyspnea Scale?
Scores of 6 and 7 generally represent severe to very severe breathing difficulty.

16. What do scores of 8 and 9 represent on the Modified Borg Dyspnea Scale?
Scores of 8 and 9 represent extremely severe or very, very severe breathing difficulty.

17. What does a score of 10 represent on the Modified Borg Dyspnea Scale?
A score of 10 represents maximal breathing difficulty or the worst breathlessness the patient can imagine.

18. Who should select the Modified Borg Dyspnea Scale rating?
The patient should select the rating that best matches the current intensity of breathing difficulty.

19. Why should the clinician avoid selecting the Borg score for the patient?
The purpose of the scale is to capture the patient’s own perception, which may differ from the clinician’s observations.

20. Why are verbal descriptions included with the numbers on the scale?
The verbal descriptions help patients identify the number that most closely matches the severity of their breathing discomfort.

21. Can two patients with the same oxygen saturation report different Borg scores?
Yes. Patients with the same oxygen saturation may experience and report very different levels of dyspnea.

22. Does a normal oxygen saturation rule out severe dyspnea?
No. A patient may experience severe breathing discomfort even when oxygen saturation remains within an acceptable range.

23. Can a patient have significant oxygen desaturation without reporting severe dyspnea?
Yes. Some patients may have a low oxygen saturation while reporting only mild breathing discomfort.

24. Does the Modified Borg Dyspnea Scale directly measure lung function?
No. It does not directly measure airflow, lung volume, oxygenation, ventilation, or respiratory muscle strength.

25. How does the Modified Borg Dyspnea Scale complement objective measurements?
It adds the patient’s personal experience of breathing difficulty to objective findings such as vital signs, oxygen saturation, and exercise performance.

26. During which types of activities can the Modified Borg Dyspnea Scale be used?
The scale can be used at rest, during walking, stair climbing, bathing, dressing, exercise, and other activities of daily living.

27. Why is a baseline Borg score useful before activity?
A baseline score provides a reference point for comparing how much dyspnea changes during or after activity.

28. How can repeated Borg scores help clinicians?
Repeated scores can show whether breathing difficulty is stable, improving, or worsening over time.

29. How can the scale be used before and after treatment?
The patient can rate dyspnea before and after an intervention so the clinician can evaluate whether breathing discomfort changed.

30. Which respiratory treatments may be evaluated with Borg ratings?
Borg ratings may be obtained before and after bronchodilator therapy, oxygen therapy, airway clearance, positioning, or breathing exercises.

31. What may a lower Borg score after treatment suggest?
A lower score may suggest that the patient feels less breathing difficulty after the intervention.

32. Why should a lower Borg score not be interpreted by itself?
The score should be considered with objective findings because symptom improvement does not always mean the underlying physiologic problem has resolved.

33. What is one major use of the Modified Borg Scale in pulmonary rehabilitation?
It helps monitor how much dyspnea a patient experiences during exercise and functional activities.

34. Why is the scale useful for patients with chronic obstructive pulmonary disease?
It helps quantify how strongly exertional breathlessness limits activity and daily function.

35. How can inactivity worsen dyspnea in chronic lung disease?
Inactivity can cause muscle deconditioning, which increases fatigue and the effort required for ordinary activity.

36. What is pulmonary rehabilitation designed to improve?
Pulmonary rehabilitation is designed to improve exercise capacity, symptom control, functional independence, and quality of life.

37. What is the six-minute walk test?
The six-minute walk test measures how far a patient can walk on a standardized course in six minutes.

38. Why is the six-minute walk test considered a functional test?
It reflects a common daily activity and shows how cardiopulmonary disease affects walking ability.

39. When should the Borg dyspnea score be recorded during a six-minute walk test?
It should be recorded before the test and again immediately after the test.

40. Which other measurements are commonly recorded with Borg scores during a walk test?
Heart rate, respiratory rate, blood pressure, oxygen saturation, walking distance, and perceived fatigue may also be recorded.

41. Why should the patient distinguish dyspnea from leg fatigue?
Separating these symptoms helps determine whether exercise limitation is mainly respiratory, muscular, or related to another problem.

42. What does an increase from a Borg score of 1 before exercise to 5 after exercise indicate?
It indicates that the patient progressed from very slight to severe dyspnea during the activity.

43. Why should the clinician ask what limited the patient’s walking distance?
The answer helps identify whether the main limitation was shortness of breath, fatigue, pain, weakness, dizziness, or another symptom.

44. Why may a reduced six-minute walk distance not be caused entirely by lung disease?
Cardiac problems, neuromuscular weakness, pain, poor balance, and physical deconditioning may also reduce walking performance.

45. Why are standardized instructions important when using the Borg Scale during exercise testing?
Standardized instructions reduce variation and make repeated test results more reliable.

46. Why should the clinician avoid suggesting a Borg rating?
Suggesting a number may influence the patient’s response and reduce the accuracy of the subjective measurement.

47. Why should a visible copy of the scale be shown to the patient?
A visible scale allows the patient to compare the numbers with the verbal descriptions before choosing a rating.

48. Why should exercise tests be performed under similar conditions when repeated?
Using the same course, oxygen system, instructions, and encouragement makes comparisons more meaningful.

49. What is the practice or learning effect during repeated walk tests?
It is the improvement that may occur because the patient becomes more familiar with the procedure and pacing.

50. How can improvement occur even when the postexercise Borg score stays the same?
A patient may walk farther or exercise longer while reporting the same level of dyspnea, showing improved functional capacity.

51. What is neuromechanical dissociation?
Neuromechanical dissociation is a mismatch between the effort used to breathe and the amount of ventilation or chest movement produced.

52. How can neuromechanical dissociation increase dyspnea?
It can make breathing feel difficult because the respiratory muscles are working hard while each breath produces only limited airflow or tidal volume.

53. Which conditions may contribute to neuromechanical dissociation?
Severe airflow obstruction, dynamic hyperinflation, restrictive lung disease, respiratory muscle weakness, and reduced chest wall movement may contribute.

54. What is respiratory drive?
Respiratory drive is the nervous system’s stimulation of breathing in response to the body’s need for oxygen, carbon dioxide removal, and acid-base balance.

55. How can an increased respiratory drive affect the patient’s breathing sensation?
It may create air hunger, an urgent need to breathe, or the feeling that the current breathing effort is inadequate.

56. Which physiologic problems can increase respiratory drive?
Hypoxemia, hypercapnia, acidosis, exercise, and increased metabolic activity can increase respiratory drive.

57. How may expiratory flow limitation be described by a patient?
The patient may say that they cannot get the air out or cannot empty the lungs completely.

58. Which type of lung disease commonly causes expiratory flow limitation?
Obstructive lung disease, such as asthma or chronic obstructive pulmonary disease, commonly causes expiratory flow limitation.

59. How may a patient describe difficulty with inspiration?
The patient may report being unable to take a deep breath or feeling that the breath stops during inhalation.

60. How may the description of dyspnea change as asthma worsens?
A patient may initially report chest tightness and later describe air hunger or difficulty inhaling deeply as bronchoconstriction and hyperinflation increase.

61. How may patients with interstitial lung disease describe dyspnea?
They may describe increased breathing effort, rapid breathing, gasping, or difficulty expanding the lungs.

62. How can fear intensify the sensation of dyspnea?
Fear can increase respiratory rate, muscle tension, and awareness of breathing discomfort, making the symptom feel more severe.

63. Why may dyspnea be more distressing in a patient with chronic disease than in a healthy person exercising?
The patient may not understand why the symptom is occurring and may fear that it will worsen or not resolve.

64. Does the Modified Borg Scale separate the physical and emotional components of dyspnea?
No. It reflects the patient’s overall perceived intensity of breathing difficulty.

65. Why is context important when interpreting a Borg score?
The same score may have different meanings depending on whether it was recorded at rest, during mild activity, or after strenuous exercise.

66. What could a Borg score of 4 at rest suggest?
It may suggest clinically important breathing discomfort because somewhat severe dyspnea is occurring without exertion.

67. Why is a Borg score of 4 after intense exercise interpreted differently from the same score at rest?
Breathing discomfort is more expected after intense exercise, while the same severity at rest may indicate greater functional impairment.

68. What patient position should be documented with a Borg rating?
The clinician should note whether the patient was lying down, sitting, standing, or performing activity when the rating was obtained.

69. Why should oxygen flow rate be documented with a Borg score?
The amount of supplemental oxygen can affect symptoms and exercise tolerance, so it is necessary for accurate comparison.

70. Why should the type of oxygen delivery system be recorded during exercise testing?
Different delivery systems may provide different levels of support and can influence oxygenation and patient performance.

71. What should be documented if the patient rests during a six-minute walk test?
The clinician should record when the rest occurred, how long it lasted, and the symptom that caused the patient to stop.

72. Why should recovery time after exercise be assessed?
Recovery time shows how quickly breathing, oxygen saturation, heart rate, and symptoms return toward baseline.

73. What may a longer recovery time indicate?
It may indicate reduced exercise tolerance, greater cardiopulmonary limitation, or worsening functional status.

74. Why is a sequence of Borg ratings more useful than a single score?
A sequence can reveal trends in symptoms during activity, treatment, rehabilitation, or disease progression.

75. Why is the Modified Borg Scale often more useful for comparing a patient with themselves over time?
Patients interpret symptoms differently, so changes within the same patient are often more meaningful than comparisons between different patients.

76. Why must the Modified Borg Dyspnea Scale be interpreted with objective measurements?
Objective measurements provide physiologic information that the subjective Borg rating cannot supply on its own.

77. Which objective tests may be considered alongside a Borg score?
Pulse oximetry, vital signs, arterial blood gas analysis, electrocardiographic monitoring, and exercise measurements may be considered.

78. Can the Modified Borg Scale diagnose the cause of shortness of breath?
No. It measures symptom intensity but does not identify the underlying cause.

79. What does a high Borg score tell the clinician?
A high score indicates that the patient perceives breathing difficulty as severe, but further assessment is needed to determine why.

80. Why may a patient with respiratory muscle weakness experience dyspnea?
Weak respiratory muscles may be unable to produce adequate ventilation despite increased effort.

81. How can lung hyperinflation contribute to breathing discomfort?
Hyperinflation places the respiratory muscles at a mechanical disadvantage and can make it difficult to take a satisfying breath.

82. Why may stiff lungs cause an increased Borg rating?
Stiff lungs require greater effort to expand, which can make breathing feel labored or uncomfortable.

83. How can cardiovascular disease contribute to dyspnea during activity?
The cardiovascular system may be unable to deliver enough oxygenated blood to meet the body’s increased demands during exertion.

84. How can physical deconditioning increase breathlessness?
Deconditioned muscles work less efficiently and require greater ventilation during ordinary activities.

85. Why can two patients with the same walking distance have different Borg scores?
They may differ in disease severity, conditioning, symptom perception, respiratory mechanics, and emotional response.

86. What may it mean if a patient walks farther while reporting a lower Borg score?
It may indicate improved exercise tolerance and reduced perceived breathing difficulty.

87. What may it mean if a patient walks the same distance but reports a higher Borg score?
It may suggest worsening symptoms or that the same activity now requires greater breathing effort.

88. Why should usual preexercise medications be taken before a six-minute walk test?
Taking prescribed medications helps ensure that the test reflects the patient’s typical treated functional ability.

89. When should a patient use supplemental oxygen during a walk test?
The patient should generally use the prescribed oxygen system if oxygen is normally required during activity.

90. Why should oxygen settings remain consistent during repeat walk tests?
Consistent oxygen settings allow clinicians to compare results without changes in oxygen therapy affecting performance.

91. What symptoms other than dyspnea should be monitored during exercise testing?
Chest pain, wheezing, dizziness, weakness, leg pain, fatigue, and balance problems should also be monitored.

92. Why should testing stop if the patient requests termination?
The patient’s symptoms may have become intolerable or unsafe, even if the clinician has not yet observed severe abnormalities.

93. Can a high Borg score contribute to the decision to stop exercise?
Yes. Intolerable dyspnea, especially when accompanied by abnormal signs, may justify reducing or stopping activity.

94. Why should a patient not be encouraged to continue through intolerable dyspnea?
Continuing may cause severe distress and could place the patient at risk if the symptom reflects cardiopulmonary instability.

95. What patient abilities are necessary for reliable use of the Modified Borg Scale?
The patient must be able to understand the instructions, recognize the sensation, and communicate a rating.

96. How can cognitive impairment affect the reliability of a Borg score?
The patient may have difficulty understanding the scale or consistently matching symptoms with a numerical rating.

97. How can a language barrier affect administration of the scale?
The patient may misunderstand the instructions or verbal descriptions unless an appropriate translation or interpreter is provided.

98. Why may extreme respiratory distress make a Borg rating less reliable?
The patient may be unable to concentrate, communicate clearly, or review the scale while struggling to breathe.

99. What is a major practical advantage of the Modified Borg Dyspnea Scale?
It is quick, inexpensive, noninvasive, and easy to repeat in many clinical settings.

100. What is the greatest clinical value of the Modified Borg Dyspnea Scale?
Its greatest value is providing a standardized way to track the patient’s perceived breathing difficulty during activity, treatment, and changes in functional status.

Final Thoughts

The Modified Borg Dyspnea Scale provides a practical way to measure the patient’s perception of breathing difficulty. Its value comes from adding subjective symptom information to objective findings such as oxygen saturation, respiratory rate, heart rate, exercise distance, and physical examination results.

The scale is especially useful during the six-minute walk test, pulmonary rehabilitation, bedside assessment, and treatment evaluation. It does not diagnose the cause of dyspnea or replace clinical monitoring.

When administered consistently and interpreted in context, it helps clinicians document symptom severity, monitor functional changes, assess treatment response, and better understand how respiratory disease affects daily life.