Are you ready to learn about all the different Respiratory Therapy Normal Values? If so, then you’ve definitely clicked on the right link.

Because below, in this study guide, we have listed out each and every normal value that is required for you to know as a Respiratory Therapist.

Not only that. You must also know and memorize them for the TMC Exam as well.

There’s no reason to fret. These normal values are very simple to learn — it just takes practice. I know you can do it if you put your mind to it! Woah, I can rhyme — how neat!

Anyways, enough rambling from me. Let’s go ahead and dive right into these uber-important normal values for Respiratory Therapy Students. Are you ready to get started?

Respiratory Therapy Normal Values:

Patient Assessment

Normal

Urine Output

40 mL/hour

Heart Rate

60 – 100 /min

Diagnostic Chest Percussion

Resonant

Breath Sounds

Vesicular

Heart Sounds

S1, S2

Blood Pressure

120/80 mmHg

range: 90/60 – 140/90 mmHg

Intracranial Pressure

5 – 10 mmHg

Cerebral Perfusion Pressure

70 – 90 mmHg

Exhaled Carbon Monoxide

< 7 for nonsmokers

 

Complete Blood Count (CBC)

Normal

Red Blood Cells (RBC)

4 – 6 mill/mm3

Hemoglobin (Hb)

12 – 16 gm

Hematocrit (Hct)

40 – 50 %

White Blood Cells

5,000 – 10,000 per mm3

 

Chemistry

Normal

Potassium (K+)

4.0 mEq/L

range:  3.5 – 4.5 mEq/L

Sodium (Na+)

140 mEq/L

range:  135 – 145 mEq/L

Chloride (Cl)

90 mEq/L

range:  80 – 100 mEq/L

Bicarb (HCO3)

24 mEq/L

range:  22 – 26 mEq/L

Creatinine

0.7 – 1.3 mg/dL

Blood Pressure

120/80 mmHg

(range: 90/60 – 140/90 mmHg)

Blood Urea Nitrogen (BUN)

8 – 25 mg/dL

Coagulation Studies

Normal

Clotting Time

Up to 6 minutes

Platelet Count

150,000 – 400,000/mm3

Activated Partial Thromboplastin Time

24 – 32 seconds

Prothrombin Time

12 – 15 seconds

 

Cardiac Enzymes

Normal

Troponin

< 0.1 ng/mL

Brain Natriuretic Peptide (BNP)

< 100 pg/mL

 

Infant Assessment

Normal

Term Infant

38 – 42 weeks

APGAR Score

7 – 10

Temperature

36.5 °C

Heart Rate

110 – 160/min

Respiratory Rate

30 – 60 breaths/min

Blood Pressure

60/40 mmHg

Birth Weight

3000 g

Dubowitz Score

40

Blood Glucose

> 30 mg/dL

L/S Ratio

2:1 or higher

 

Hemodynamic Monitoring

Normal

Mean Arterial Pressure (MAP)

93 – 94 mmHg

Right Atrial Pressure (RAP) or Central Venous Pressure (CVP)

2 – 6 mmHg

4 – 12 cmH2O

Right Ventricle Pressure

25/0 mmHg

Pulmonary Artery Pressure (PAP)

25/8 mmHg

Mean 13 – 14 mmHg

Pulmonary Capillary Pressure

8 – 10 mmHg

Pulmonary Capillary Wedge Pressure (PCWP)

4 – 12 mmHg

Left Atrial Pressure

2 – 6 mmHg

Left Ventricle Pressure

120/0 mmHg

Cardiac Output

4 – 8 L/min

Pulse Pressure

40 mmHg

Systemic Vascular Resistance (SVR)

< 20 mmHg/L/min   or  

1600 dynes/sec/m-5

Pulmonary Vascular Resistance (PVR)

< 2.5 mmHg/L/min   or  

200 dynes/sec/cm-5

Cardiac Index

2.5 – 4 L/min/m2

Laryngoscope Blade Sizes

Normal

Adult

3

Pediatric

2

Term Infant

1

Pre-Term Infant

0

 

ET Tube Sizes & Markings

Normal

Pre-Term Infant

2. – 3.0 mm

Term Infant

3.0 – 3.5 mm

Adult Male

8.0 – 8.5 mm

Adult Female

7.0 – 7.5 mm

Oral Intubation

21 – 25 cm at the lip

Nasal Intubation

26 – 29 cm at the nares

Monitoring Data

Normal

Capnography

30 torr

3 – 5 %

Pulse Oximetry

93 – 97 %

Carboxyhemoglobin (COHb)

0 – 1 %

Cuff Pressure

20 – 25 mmHg

25 – 35 cmH2O

Calculations

Normal

PAO2

Varies directly with the patient’s FiO2 and PB

A-aDO2

Varies directly with the patient’s FiO2

P/F Ratio

≥ 380 torr

CaO2

17 – 20 vol%

CvO2

12 – 16 vol%

C(a-v)O2

4 – 5 vol%

Cardiac Output (QT)

4 – 8 L/min

QS/QT

3 – 5 %

SaO2

98 %     or    

95 – 100 %

Oxygen Index (OI)

< 10

VD/VT Ratio

20 – 40 %

 

Arterial Blood Gases (Adult)

Normal

PCO2

40 torr

range:  35 – 45 torr

PaO2

97 torr

range:  80 – 100 torr

pH

7.40

range:  7.35 – 7.45

HCO3

22 – 26 mEq/L

BE

-2 – +2

 

Newborn Arterial Blood Gases

Normal

PaCO2

< 50 torr

PaO2

> 60 torr

pH

> 7.30

PFTsNormal
Calibration Syringe3.0 liters
Maximum Inspiratory Pressure (MIP)80 cmH2O
Maximum Expiratory Pressure (MEP)160 cmH2O

 

Typical ValuesNormal
VC4.8 liters   or

80 % of predicted or higher

FEV14.0 liters   or

80 % of predicted or higher

FEV1/FVC83 %
FEF200-12006.0 L/sec   or

80 % of predicted or higher

FEF25-75%4.7 L/sec   or

80 % of predicted or higher

Peak Expiratory Flowrate (PEFR)10 L/sec (600L/min) 80% of predicted
Airway Resistance0.6 – 2.4 cmH2O/L/sec
Compliance60 – 100 mL/cmH2O
DLCO25 mL CO/min/mmHg

Typical Values

Normal

Tidal Volume (VT)

5 – 8 mL/kg

Vital Capacity (VC)

65 – 75 mL/kg    or  

10 x VT

Respiratory Rate

12 – 20 breaths/min

Minute Ventilation (VE)

5 – 6 L/min

Maximum Inspiratory Pressure (MIP)

80 cmH2O

Maximum Expiratory Pressure (MEP)

160 cmH2O

Static Lung Compliance

60 – 100 mL/cmH2O

Mean Airway Pressure

5 – 10 cmH2O

Anatomic Deadspace

1 mL/pound of ideal body weight

Work of Breathing (WOB)

0.5 ± 0.2 J/L

1 Hz

60 cycles/min

Final Thoughts

So there you have it! That wraps up our study guide on the normal values that you must know as a Respiratory Therapist. But let’s not get ahead of ourselves. If you’re reading this right now, then you’re most likely a student.

The good thing about that is this — if you can go ahead and learn these normal values now, it will definitely pay off for you in a big way in the future. Because you will use them all throughout your career as a Respiratory Therapist.

Not to mention, you must know them in order to pass the TMC Exam and CSE as well. So like I said, it’s super important for you to master these normal values as soon as possible. And now that you have this study guide, I’m confident that you can do just that.

Thank you for reading and as always, breathe easy my friend. 

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