Oxygen Concentrator: Uses, Types, Safety, and Setup

An oxygen concentrator is a medical device that provides supplemental oxygen by taking in room air, removing nitrogen, and delivering oxygen-enriched gas to the patient. It is commonly used in home care, postacute care, and long-term oxygen therapy for people who need ongoing oxygen support outside the hospital.

Unlike compressed oxygen cylinders or liquid oxygen systems, an oxygen concentrator does not store oxygen that was produced elsewhere. Instead, it produces oxygen from the surrounding air as long as electrical power is available.

What Is an Oxygen Concentrator?

An oxygen concentrator is an electrically powered device that separates oxygen from room air. Room air contains about 21% oxygen, with most of the remaining gas being nitrogen. For people with chronic lung disease or other conditions that impair oxygenation, room air may not provide enough oxygen to maintain adequate blood oxygen levels.

The oxygen concentrator solves this problem by pulling in room air, removing a large portion of the nitrogen, and delivering a higher concentration of oxygen through a nasal cannula, mask, or other oxygen delivery device.

Oxygen concentrators are most often used for patients who need long-term oxygen therapy at home. They are also used in other alternative care and postacute care settings where bulk oxygen systems are not available. In hospitals, oxygen is often supplied through a central pipeline system. In the home, that type of oxygen infrastructure is not available, so patients typically rely on one of three systems:

1. Compressed oxygen cylinders
2. Liquid oxygen systems
3. Oxygen concentrators

Note: Of these options, oxygen concentrators are often the most practical and economical for patients who need continuous low-flow oxygen.

Why Oxygen Concentrators Are Used

Oxygen concentrators are used because many patients need supplemental oxygen for long periods of time. Conditions such as chronic obstructive pulmonary disease, pulmonary fibrosis, advanced heart disease, pulmonary hypertension, and other chronic cardiopulmonary disorders can impair oxygen delivery to the blood.

For these patients, oxygen therapy may be prescribed to improve oxygen saturation, reduce hypoxemia, relieve symptoms, and support daily activity. Some patients only need oxygen during sleep or exertion, while others require oxygen continuously.

A stationary oxygen concentrator is especially useful for patients with limited activity who spend much of their time at home. These patients may not need a highly portable system for frequent travel or ambulation. Instead, they may need a reliable oxygen source that can run for long periods each day.

Portable oxygen concentrators are designed for patients who need oxygen while walking, traveling, or leaving the home. These devices help improve independence by allowing patients to receive oxygen without depending only on large cylinders or stationary equipment.

How an Oxygen Concentrator Works

The basic function of an oxygen concentrator is to produce oxygen-enriched gas from room air. The most common type is the molecular sieve oxygen concentrator.

A molecular sieve concentrator uses an air compressor to pull room air into the device. The air passes through inlet filters and then enters canisters that contain zeolite pellets. These pellets are made of sodium-aluminum silicate, a material that can absorb nitrogen and water vapor from the gas mixture.

As nitrogen is removed, the remaining gas becomes enriched with oxygen. This oxygen-enriched gas then passes through the system and is delivered to the patient through a flowmeter and patient outlet.

Most molecular sieve concentrators use two canisters. While one canister is actively removing nitrogen from incoming room air, the other is being purged of nitrogen and water vapor. The canisters alternate back and forth so the device can continue producing oxygen. This process is known as pressure swing adsorption.

The main parts of a molecular sieve concentrator include:

• Inlet filter
• Compressor
• Molecular sieve beds
• Check valves
• Accumulator
• Pressure regulator
• Flowmeter
• Patient outlet

Note: Each part plays a role in filtering air, concentrating oxygen, regulating pressure, and delivering the prescribed flow to the patient.

Oxygen Concentration and Flow

One of the most important points about oxygen concentrators is that the delivered oxygen concentration depends on the flow setting and the type of device.

With many molecular sieve concentrators, oxygen concentration decreases as flow increases. This means the device may provide a high oxygen percentage at lower flows but a lower oxygen percentage at higher flows.

For example, a molecular sieve concentrator may deliver approximately:

• 95% to 92% oxygen at 1 to 2 L/min
• 92% to 85% oxygen at 3 to 5 L/min
• Less than 85% oxygen at flows greater than 6 L/min

This matters because the patient’s oxygen prescription must match the capabilities of the device. A patient who only needs 2 L/min by nasal cannula may do well with a standard home concentrator. However, a patient who needs higher flows or a more precise oxygen concentration may require a different setup.

Many traditional home concentrators have a maximum flow of about 5 L/min. Newer models may deliver up to 10 L/min. Some high-intensity concentrators can provide higher pressures and flows, which may be necessary for patients who use higher-flow delivery devices.

A patient requiring a Venturi mask or nonrebreathing mask may need a device that can meet higher flow demands. If the oxygen source cannot support the required flow, the patient may not receive the intended oxygen concentration.

Types of Oxygen Concentrators

There are two main types of oxygen concentrators commonly described in respiratory care:

1. Molecular sieve oxygen concentrators
2. Semipermeable plastic membrane oxygen concentrators

Each type separates oxygen from room air differently.

Molecular Sieve Oxygen Concentrators

Molecular sieve concentrators are the most common type used in home care. They use zeolite pellets to remove nitrogen and water vapor from room air. This produces oxygen-enriched gas that is delivered to the patient.

These devices can provide high oxygen concentrations at lower flows, making them useful for many patients who require low-flow oxygen therapy at home. However, the oxygen percentage may fall as the liter flow increases.

Because molecular sieve concentrators produce dry gas, some patients may need humidification, especially at higher nasal cannula flows or if they complain of nasal dryness.

Semipermeable Membrane Oxygen Concentrators

A semipermeable plastic membrane oxygen concentrator uses a thin membrane to separate gases. Room air is pulled through the membrane by a vacuum pump. Oxygen molecules and water vapor pass through the membrane faster than nitrogen. Excess water vapor is removed by a condenser system.

These devices deliver a lower oxygen percentage than molecular sieve concentrators. A semipermeable membrane unit may deliver a fixed oxygen concentration of about 40%, with flow settings that can range from 1 to 10 L/min.

Because some moisture remains in the delivered gas, an external humidifier is usually not needed with this type of concentrator. However, these units provide a lower oxygen concentration at a given flow compared with molecular sieve systems.

Stationary Oxygen Concentrators

A stationary oxygen concentrator is typically used as the main oxygen source in the home. It is designed to run on electrical power and provide oxygen for long periods. Many patients use a stationary concentrator while resting, sleeping, or performing activities inside the home.

Stationary concentrators are larger than portable models, but they are usually more powerful and can often provide continuous-flow oxygen. For patients who require oxygen for many hours per day, a stationary unit is often the most cost-efficient option.

A patient with limited activity may only need a stationary concentrator plus a backup oxygen cylinder. The concentrator provides the main oxygen supply, while the cylinder is available for power outages, device malfunction, or emergencies.

Portable Oxygen Concentrators

A portable oxygen concentrator, or POC, is a smaller device designed to support mobility. It may run on household AC power, 12-volt DC power, or batteries. This makes it useful for walking, shopping, appointments, travel, and other activities outside the home.

Portable oxygen concentrators may deliver oxygen in one of two ways:

1. Continuous flow
2. Pulse dose

A continuous-flow POC delivers oxygen throughout the breathing cycle. This type may be needed for patients with higher oxygen requirements or for those who cannot reliably trigger a pulse-dose device.

A pulse-dose POC delivers oxygen only when it senses the patient’s inspiratory effort. This conserves oxygen and battery power. Pulse-dose oxygen is often adequate for patients with lower oxygen needs, but it is not appropriate for every patient.

The patient must be able to trigger the device consistently. If the patient is mouth breathing, breathing shallowly, or severely short of breath, the POC may fail to sense nasal inspiration. In that case, oxygen delivery may be reduced or interrupted.

Note: This is why patient assessment is essential before recommending a portable oxygen concentrator.

Clinical Assessment for Portable Oxygen Concentrators

A portable oxygen concentrator should not be selected only because it is convenient. The patient must be evaluated to make sure the device meets their oxygen needs.

The respiratory therapist should assess the patient’s oxygen saturation during rest and activity. Ambulation testing is especially important because many patients desaturate with exertion. A patient may maintain acceptable oxygen saturation while sitting but drop significantly while walking.

The respiratory therapist should confirm that the POC maintains adequate oxygen saturation during the activities the patient is expected to perform. This may include walking on level ground, climbing stairs, or performing basic daily tasks.

The respiratory therapist should also determine whether the patient can trigger a pulse-dose system. If the patient cannot reliably trigger the device, a continuous-flow system or another oxygen source may be needed.

Portable oxygen concentrators are approved for use on many commercial aircraft, but the patient still needs to confirm airline requirements before travel. During air travel, oxygen needs may increase because cabin pressure is lower than at sea level. In general, a portable concentrator capable of continuous flow may be necessary for patients who require a higher oxygen concentration during flight.

Oxygen Concentrators and Home-Fill Systems

Some home oxygen systems allow patients to fill small portable oxygen cylinders from a stationary concentrator. These are known as home-fill systems.

A home-fill system uses a concentrator along with a compressor or filling station. The patient can fill small cylinders with oxygen and use them for mobility outside the home. These cylinders often have preattached regulators, making them easier to use.

This setup allows the stationary concentrator to serve two purposes. It provides oxygen in the home and supports portable oxygen use when the patient needs to leave the house.

Home-fill systems can improve independence, but they require careful instruction. Patients and caregivers must know how to operate the filling station safely, how to check cylinder pressure, and when to use the backup oxygen supply.

Oxygen Concentrators and Cost

One major advantage of oxygen concentrators is cost-effectiveness. For patients who need continuous low-flow oxygen, a concentrator is often more economical than relying on multiple compressed gas cylinders or liquid oxygen systems.

A concentrator can run continuously as long as electricity is available. It does not need frequent oxygen deliveries in the same way that cylinders or liquid oxygen systems do.

For home use, a concentrator running 24 hours per day may increase the average monthly electrical bill by about 5% to 10%. The compressor also gives off heat, which can affect room temperature and energy use depending on the season.

Even with those considerations, oxygen concentrators are often described as the most cost-efficient oxygen supply method for patients in alternative care settings who require continuous low-flow oxygen.

Maintenance Requirements

Oxygen concentrators require routine maintenance to function properly. Patients should not be expected to repair internal parts of the device, but they should know how to perform basic checks and cleaning tasks.

Important maintenance tasks include:

• Checking the device daily
• Keeping air inlets clear
• Cleaning air-inlet filters as instructed
• Watching for alarms or warning lights
• Checking tubing for kinks or disconnections
• Making sure backup oxygen is available
• Scheduling preventive maintenance

Air-inlet filters should be cleaned regularly. Some sources recommend weekly cleaning, while others describe monthly checks depending on the device and manufacturer instructions. The safest approach is to follow the manufacturer’s recommendations and the home-care provider’s instructions.

The delivered oxygen concentration should also be checked periodically. Some home-care providers check this monthly or during routine service visits. Preventive maintenance is commonly performed yearly or according to manufacturer guidelines.

Note: Molecular sieve units may require scheduled replacement of the zeolite pellet canisters. If the pellets become exhausted, the concentrator may no longer produce adequate oxygen concentration.

Alarms and Safety Features

Many oxygen concentrators include visual or audible alarms. These alarms may warn the patient or caregiver about problems such as:

• Power failure
• Low pressure
• High pressure
• Low oxygen concentration
• Device malfunction

A low-oxygen alarm is especially important because the device may still be running even if the oxygen concentration is inadequate. If the concentrator cannot deliver enough oxygen, the patient may become hypoxemic without realizing the problem right away.

A useful rule is that if a concentrator cannot supply at least 85% oxygen at 5 L/min, the pellet canisters are probably exhausted and should be replaced. Some references use a range of less than 85% to 90% of the manufacturer’s specifications as a sign of inadequate oxygen output.

Note: If the oxygen concentration is too low, the patient should be placed on backup oxygen, and the home-care provider should be contacted.

Troubleshooting Common Problems

Troubleshooting is a key part of oxygen concentrator education. Patients and caregivers should know what to do when something seems wrong, but they should not disassemble or repair the unit themselves.

If No Gas Seems to Be Coming From the Cannula

If a patient does not feel oxygen flowing from the nasal cannula, a simple check is to place the cannula prongs into a glass of water. If bubbles appear, gas is flowing. If there are no bubbles, the patient should check for a kink, disconnection, or obstruction in the tubing.

If the problem cannot be corrected quickly, the patient should switch to the backup oxygen system and contact the home-care provider.

If the Concentrator Will Not Turn On

If the concentrator will not turn on, the first step is to check the power source. The patient or caregiver should make sure the unit is plugged in and that the outlet is working. They may also check whether a circuit breaker has tripped.

If electrical power is available but the concentrator still does not work, the patient should use the backup oxygen supply and contact the home-care provider.

If the Unit Sounds Abnormal

Odd cycling noises, unusual sounds, or frequent alarms may indicate a malfunction. The patient should not continue relying on a device that may not be delivering oxygen properly.

The safest response is to switch to backup oxygen at the prescribed flow and contact the home-care provider.

If the Oxygen Concentration Is Low

If the analyzed oxygen concentration is below the expected range, the concentrator may have exhausted pellet canisters or another internal problem. The patient should be placed on backup oxygen, and the concentrator should be serviced or replaced.

If the Patient Has Nasal Dryness

If a patient is receiving oxygen by nasal cannula at 4 L/min or higher and complains of nasal dryness, a bubble humidifier may be added. Humidification can improve comfort and reduce nasal irritation.

Backup Oxygen Planning

Because oxygen concentrators depend on electricity, backup oxygen is essential. Every patient using a concentrator should have an emergency oxygen supply available.

The backup system is usually a compressed gas cylinder with a regulator and appropriate delivery device. At minimum, many patients may need an E cylinder for emergencies. Patients in remote areas or those with higher oxygen needs may require multiple large cylinders or an emergency generator.

The home-care respiratory therapist should make sure the patient and caregiver know:

• Where the backup cylinder is stored
• How to turn it on
• How to set the prescribed flow
• How much oxygen is available
• When to use it
• Who to call when equipment fails

If a patient depends on an oxygen concentrator, the electric power company should be notified in writing that life-support equipment is being used in the home. The local fire department should also be informed that oxygen is present in the home.

This planning is important because home oxygen problems cannot always be fixed immediately. A hospital may have quick access to backup systems and staff, but patients at home need a clear plan before a problem occurs.

Patient and Caregiver Education

Education is one of the most important responsibilities when setting up a home oxygen concentrator. The patient and caregiver should receive verbal and written instructions. They should also demonstrate correct use of the equipment before being left to manage it independently.

Education should include:

• How to turn the concentrator on and off
• How to set the prescribed flow
• How to connect the cannula or mask
• How to check for gas flow
• How to clean filters
• What alarms mean
• When to switch to backup oxygen
• How to use the backup cylinder
• When to call the home-care provider
• Oxygen safety rules

The respiratory therapist should document that the patient or caregiver can use the equipment correctly. This is especially important for patients who are elderly, anxious, visually impaired, physically limited, or dependent on caregivers.

Patients should also be reminded not to change the flow setting unless instructed by a clinician. Increasing the flow above the prescription may not solve the problem and could cause the concentrator to deliver a lower oxygen concentration if the device exceeds its intended flow capacity.

Oxygen Safety at Home

Oxygen itself is not flammable, but it supports combustion. This means fires can start more easily and burn more intensely in an oxygen-rich environment.

Patients using oxygen concentrators should follow basic safety rules:

• Do not smoke around oxygen
• Keep oxygen away from open flames
• Avoid candles, gas stoves, and fireplaces while using oxygen
• Keep oxygen equipment away from heat sources
• Post “No Smoking” signs
• Store backup cylinders securely
• Avoid petroleum-based products near the cannula
• Keep tubing arranged to reduce tripping hazards

Note: Long oxygen tubing can help patients move around the home, but it can also create fall risks. Tubing should be positioned carefully, especially in hallways, doorways, stairs, and areas where the patient walks frequently.

Exam Tips About Oxygen Concentrators

For respiratory therapy exams, oxygen concentrators are commonly tested in home-care scenarios. The most important concepts involve device selection, troubleshooting, maintenance, and backup oxygen.

Important exam points include:

• Oxygen concentrators remove nitrogen from room air
• Molecular sieve units use zeolite pellets
• Oxygen concentration decreases as flow increases
• Low-flow home oxygen patients often do well with concentrators
• Ambulatory patients need portable oxygen options
• Many portable concentrators use pulse-dose delivery
• Pulse-dose systems require reliable nasal inspiratory triggering
• Mouth breathing can interfere with pulse-dose delivery
• Low oxygen output may indicate exhausted pellet canisters
• Filters must be cleaned or replaced as instructed
• Backup oxygen must always be available
• Patients should switch to backup oxygen when the concentrator fails
• Patients should not disassemble or repair the concentrator
• The home-care provider should be contacted for equipment malfunction

Note: A common board-style answer for concentrator failure is: Turn off the unit, switch to backup oxygen, and contact the home-care provider. This approach protects the patient from inadequate oxygen delivery while avoiding unsafe equipment repair attempts.

Advantages of Oxygen Concentrators

Oxygen concentrators offer several advantages for home oxygen therapy. They are economical for continuous low-flow oxygen, do not require frequent cylinder deliveries, and can provide a reliable oxygen source as long as electricity is available.

Stationary units are useful for patients who spend most of their time at home. Portable units allow greater mobility and independence. Home-fill systems can also support ambulation by allowing patients to fill small portable cylinders.

Note: For many patients, oxygen concentrators make long-term oxygen therapy more manageable and less dependent on frequent deliveries or large storage systems.

Limitations of Oxygen Concentrators

Oxygen concentrators also have limitations. They require electricity, which means backup oxygen is necessary during power outages. They also require maintenance, filter cleaning, alarm awareness, and periodic service.

Flow capacity is another limitation. Not every concentrator can meet high-flow oxygen needs. Some units are limited to 5 L/min, while others can provide 10 L/min or more. The oxygen concentration may fall at higher flows, especially in molecular sieve units.

Portable concentrators also have limitations. Many provide pulse-dose oxygen only, which may not be appropriate for patients with high oxygen needs, mouth breathing, shallow breathing, or inability to trigger the device reliably.

Note: The respiratory therapist must match the equipment to the patient’s prescription, activity level, oxygen saturation, and lifestyle.

Oxygen Concentrator Practice Questions

1. What is an oxygen concentrator?
An oxygen concentrator is an electrically powered device that takes in room air, removes nitrogen, and delivers oxygen-enriched gas to a patient.

2. How does an oxygen concentrator differ from a compressed oxygen cylinder?
An oxygen concentrator produces oxygen-enriched gas from room air, while a compressed oxygen cylinder stores oxygen that has already been produced.

3. What gas is primarily removed from room air by an oxygen concentrator?
Nitrogen is primarily removed from room air.

4. Why are oxygen concentrators commonly used in home care?
They are commonly used in home care because they provide a cost-effective source of oxygen for patients who need long-term, low-flow oxygen therapy.

5. What are the three common oxygen supply methods used in alternative care settings?
The three common methods are compressed oxygen cylinders, liquid oxygen systems, and oxygen concentrators.

6. Why are oxygen concentrators especially useful outside the hospital?
They are useful because many home and postacute care settings do not have bulk oxygen storage systems like hospitals do.

7. What is the primary role of an oxygen concentrator in postacute care?
Its primary role is to provide supplemental oxygen to patients who require ongoing oxygen therapy outside the acute hospital setting.

8. What is a portable oxygen concentrator?
A portable oxygen concentrator is a smaller device that removes nitrogen from room air and provides oxygen-enriched gas while allowing greater mobility.

9. What does POC stand for?
POC stands for portable oxygen concentrator.

10. What type of patient may benefit from a portable oxygen concentrator?
A patient who requires low-flow oxygen and wants greater mobility may benefit from a portable oxygen concentrator.

11. What power sources may be used by a portable oxygen concentrator?
A portable oxygen concentrator may run on household AC power, 12-volt DC power, or batteries.

12. What is one major advantage of portable oxygen concentrators?
They allow patients receiving oxygen therapy to move beyond the limits of their homes and maintain greater independence.

13. Why must a respiratory therapist assess a patient before recommending a portable oxygen concentrator?
The respiratory therapist must make sure the device can maintain acceptable oxygen saturation during ambulation and activity.

14. What should be checked during ambulation when evaluating a patient for a portable oxygen concentrator?
The patient’s oxygen saturation should be checked during walking or activity.

15. Why might a pulse-dose portable concentrator fail to deliver oxygen effectively?
It may fail if the patient is mouth breathing, breathing shallowly, or unable to trigger the device through nasal inspiration.

16. What is the difference between continuous flow and pulse-dose oxygen delivery?
Continuous flow delivers oxygen throughout the breathing cycle, while pulse-dose delivery provides oxygen only when the device senses inspiration.

17. Why does pulse-dose technology help conserve oxygen and battery power?
It only delivers oxygen during inspiration instead of continuously throughout the entire breathing cycle.

18. What type of portable concentrator may be needed for patients with higher oxygen needs?
A continuous-flow portable oxygen concentrator may be needed for patients with higher oxygen needs.

19. Why can air travel increase oxygen concerns for some patients?
Cabin pressure is lower during air travel, which may increase a patient’s need for supplemental oxygen.

20. What must patients confirm before using a portable oxygen concentrator on an aircraft?
They should confirm that the device is approved for use by the airline and that it meets their oxygen needs during flight.

21. What is the most common type of oxygen concentrator used in home care?
The molecular sieve oxygen concentrator is the most common type used in home care.

22. What material is commonly used in the canisters of a molecular sieve oxygen concentrator?
Zeolite pellets, made of sodium-aluminum silicate, are commonly used.

23. What do zeolite pellets remove from the gas mixture?
They remove nitrogen and water vapor from room air.

24. What is pressure swing adsorption?
Pressure swing adsorption is the alternating process in which one sieve canister filters room air while the other is purged of nitrogen and water vapor.

25. Why do molecular sieve concentrators usually have two canisters?
They have two canisters so one canister can filter incoming air while the other is being cleared of trapped gases.

26. What happens to oxygen concentration as flow increases in many molecular sieve concentrators?
The oxygen concentration decreases as the liter flow increases.

27. Approximately what oxygen concentration can a molecular sieve concentrator deliver at 1 to 2 L/min?
It can deliver approximately 95% to 92% oxygen at 1 to 2 L/min.

28. Approximately what oxygen concentration can a molecular sieve concentrator deliver at 3 to 5 L/min?
It can deliver approximately 92% to 85% oxygen at 3 to 5 L/min.

29. What may happen to delivered oxygen concentration at flows greater than 6 L/min?
The delivered oxygen concentration may fall below 85%.

30. Why is it important to match the oxygen concentrator to the patient’s prescribed flow?
The device must be capable of delivering the required flow and oxygen concentration needed by the patient.

31. What is the typical maximum flow for many traditional oxygen concentrators?
Many traditional oxygen concentrators have a maximum flow of about 5 L/min.

32. What flow may some newer oxygen concentrator models provide?
Some newer models can deliver up to 10 L/min.

33. Why might a patient need a high-intensity oxygen concentrator?
A patient may need one if they require higher pressures or higher flows for oxygen delivery.

34. What types of oxygen delivery devices may require a higher-capacity concentrator?
Venturi masks and nonrebreathing masks may require a higher-capacity concentrator.

35. Why might a standard concentrator be appropriate for a patient using a low-flow nasal cannula?
A standard concentrator can usually meet the oxygen needs of patients requiring low-flow oxygen therapy.

36. What is a semipermeable membrane oxygen concentrator?
It is a concentrator that uses a thin plastic membrane to separate oxygen from nitrogen in room air.

37. How does oxygen pass through a semipermeable membrane concentrator?
Oxygen molecules pass through the membrane faster than nitrogen molecules.

38. What pulls room air through the membrane in a semipermeable membrane concentrator?
A vacuum pump pulls room air through the membrane.

39. Why is an external humidifier usually not needed with a semipermeable membrane concentrator?
Some water vapor remains in the oxygen-enriched gas, so additional humidification is usually not needed.

40. What oxygen concentration is typically delivered by a semipermeable membrane concentrator?
It typically delivers a fixed oxygen concentration of about 40%.

41. What flow range may a semipermeable membrane concentrator provide?
It may provide flows from 1 to 10 L/min.

42. Which type of concentrator generally provides a higher oxygen percentage at low flows?
A molecular sieve concentrator generally provides a higher oxygen percentage at low flows.

43. Why are molecular sieve concentrators often paired with humidifiers?
They deliver dry gas, which may cause nasal dryness, especially at higher flows.

44. When should a bubble humidifier be considered for a nasal cannula patient?
A bubble humidifier should be considered when the patient is using 4 L/min or more and complains of nasal dryness.

45. What is a stationary oxygen concentrator?
A stationary oxygen concentrator is a larger home oxygen device designed to provide oxygen for long periods while connected to electrical power.

46. Who is a stationary oxygen concentrator best suited for?
It is best suited for a patient with limited activity who needs long-term oxygen at home.

47. What additional oxygen source should a patient have when using a stationary concentrator?
The patient should have a backup compressed oxygen cylinder.

48. Why is backup oxygen necessary for patients using concentrators?
Backup oxygen is necessary because concentrators require electricity and may stop working during power outages or equipment failure.

49. What is a home-fill oxygen system?
A home-fill system allows small portable oxygen cylinders to be filled from an oxygen concentrator.

50. Why are home-fill systems useful for home oxygen patients?
They provide portable oxygen for ambulation and activity while allowing the concentrator to remain the main home oxygen source.

51. Why is an oxygen concentrator considered cost-effective for continuous low-flow oxygen?
It is cost-effective because it can run continuously from electrical power without requiring frequent oxygen cylinder deliveries.

52. How much may a home oxygen concentrator increase the average monthly electrical bill?
A concentrator running 24 hours per day may increase the average monthly electrical bill by about 5% to 10%.

53. What effect can the compressor of an oxygen concentrator have in the home?
The compressor can give off heat, which may affect room temperature and energy use.

54. What type of patient is an oxygen concentrator especially economical for?
It is especially economical for a patient who requires continuous low-flow oxygen therapy at home.

55. What routine maintenance should be performed on an oxygen concentrator?
Routine maintenance includes checking the device, cleaning filters, monitoring alarms, inspecting tubing, and following preventive maintenance recommendations.

56. How often should air-inlet filters be cleaned according to common home-care guidance?
Air-inlet filters should commonly be cleaned weekly, although the exact schedule should follow the manufacturer’s instructions.

57. Why must air-inlet filters be kept clean?
They must be kept clean so room air can enter the concentrator properly and the device can function efficiently.

58. How often should preventive maintenance generally be performed on an oxygen concentrator?
Preventive maintenance is commonly performed yearly or according to the manufacturer’s recommendations.

59. Why should the delivered oxygen concentration be checked periodically?
It should be checked to make sure the concentrator is producing an adequate oxygen concentration for patient use.

60. What may cause a low analyzed oxygen concentration from a molecular sieve concentrator?
Exhausted zeolite pellet canisters may cause the device to deliver a low oxygen concentration.

61. What should be suspected if a concentrator cannot supply at least 85% oxygen at 5 L/min?
The pellet canisters are probably exhausted and should be replaced.

62. What should be done if the oxygen concentration from the concentrator is below the expected range?
The patient should be placed on backup oxygen, and the home-care provider should be contacted for repair or replacement.

63. What types of alarms may oxygen concentrators have?
They may have alarms for power failure, low pressure, high pressure, low oxygen concentration, or general malfunction.

64. Why is a low-oxygen alarm important?
It alerts the patient or caregiver that the device may not be delivering oxygen at an adequate concentration.

65. What should a patient do if the oxygen concentrator alarm sounds and the problem cannot be corrected quickly?
The patient should switch to the backup oxygen supply and contact the home-care provider.

66. What simple test can be used if the patient does not feel oxygen coming from the nasal cannula?
The patient can place the cannula prongs into a glass of water and look for bubbles.

67. What does bubbling from the nasal cannula prongs in water indicate?
Bubbling indicates that gas is flowing through the cannula.

68. If no bubbles appear when the cannula prongs are placed in water, what should be checked?
The patient should check for a disconnection, kink, or obstruction in the tubing.

69. What should the patient do if no gas flow is present and the problem cannot be fixed?
The patient should switch to the backup oxygen cylinder and contact the home-care provider.

70. What is the first thing to check if an oxygen concentrator will not turn on?
The first thing to check is the electrical power source, including the plug, outlet, and circuit breaker.

71. If the power source is working but the concentrator still will not operate, what should be done?
The patient should be placed on backup oxygen, and the concentrator should be replaced or repaired.

72. Why should patients not disassemble an oxygen concentrator to fix it?
They should not disassemble it because internal repairs should be performed by trained home-care or service personnel.

73. What is the safest action when a concentrator makes unusual cycling noises and oxygen delivery is uncertain?
The safest action is to switch to the backup oxygen cylinder at the prescribed flow and contact the home-care provider.

74. Why should patients avoid increasing the flow above the prescribed setting during concentrator problems?
Increasing the flow above the prescription may not correct the problem and may reduce the delivered oxygen concentration if the device exceeds its capacity.

75. What is the general board-style response to a malfunctioning home oxygen concentrator?
Turn off the unit, switch to backup oxygen, and contact the home-care provider.

76. Why should every patient using a home oxygen concentrator have a backup oxygen supply?
Because the concentrator depends on electricity and may stop working during a power outage or equipment malfunction.

77. What type of backup oxygen source is commonly recommended for a concentrator-dependent patient?
A compressed gas oxygen cylinder with a regulator and delivery device is commonly recommended.

78. What is the minimum backup cylinder often mentioned for home oxygen emergencies?
An E cylinder is often mentioned as a minimum backup supply for emergencies.

79. Why might a patient in a remote area need more than one backup oxygen cylinder?
Because equipment service or oxygen delivery may take longer to arrive during an emergency.

80. Why might an emergency generator be considered for some home oxygen patients?
It may be needed when the patient depends heavily on electrical oxygen equipment and lives in an area where power outages or delays are a concern.

81. Who should be notified when life-support oxygen equipment is used in the home?
The electric power company should be notified in writing.

82. Why should the local fire department be informed that oxygen is present in the home?
They should be informed because oxygen supports combustion and creates additional fire safety concerns.

83. What should patients and caregivers be taught before using an oxygen concentrator at home?
They should be taught how to operate the device, set the prescribed flow, respond to alarms, clean filters, use backup oxygen, and follow oxygen safety rules.

84. Why should written instructions be provided along with verbal teaching?
Written instructions help reinforce education and give the patient or caregiver a reference after the respiratory therapist leaves.

85. Why should the patient or caregiver demonstrate correct concentrator use?
A return demonstration confirms that they can safely operate the equipment and respond appropriately to problems.

86. What should the respiratory therapist document after teaching oxygen concentrator use?
The respiratory therapist should document that the patient or caregiver received instruction and demonstrated correct equipment use.

87. What oxygen safety rule is most important for patients using a concentrator at home?
Smoking should not be allowed near oxygen equipment.

88. Why is smoking dangerous around an oxygen concentrator?
Oxygen supports combustion, making fires start more easily and burn more intensely.

89. What type of signs may be posted in a home where oxygen is used?
“No Smoking” signs may be posted.

90. Why should oxygen tubing be arranged carefully in the home?
Long oxygen tubing can create a tripping hazard and increase the risk of falls.

91. Why should oxygen equipment be kept away from open flames?
Open flames can ignite materials more easily in an oxygen-enriched environment.

92. Why should patients avoid petroleum-based products near the cannula?
Petroleum-based products can increase fire risk when used around oxygen equipment.

93. What is one benefit of using long oxygen tubing with a stationary concentrator?
It allows the patient to move around the home while remaining connected to the oxygen source.

94. What is one risk of using long oxygen tubing with a stationary concentrator?
It can become a fall hazard if it is not positioned safely.

95. In a pulmonary rehabilitation scenario, why might a portable concentrator alarm after exercise?
It may alarm if the device is in pulse-flow mode and cannot sense the patient’s nasal inspiration.

96. Why can mouth breathing interfere with a pulse-flow portable oxygen concentrator?
Mouth breathing may prevent the device from detecting nasal inspiration, so oxygen may not be delivered properly.

97. What should the respiratory therapist do first if a patient’s portable concentrator alarms after exercise and the patient is distressed?
The respiratory therapist should place the patient on a reliable oxygen source, such as an oxygen tank, and help reduce anxiety and hyperventilation.

98. What setting error may cause a portable concentrator to fail during exertion?
The device may have been accidentally changed from continuous flow to pulse flow.

99. Why must respiratory therapists understand portable concentrator alarms and settings?
They must recognize whether the problem is related to device malfunction, incorrect settings, or the patient’s breathing pattern.

100. What is the main clinical takeaway about oxygen concentrators?
Oxygen concentrators are useful and cost-effective for long-term oxygen therapy, but safe use requires proper patient selection, education, maintenance, troubleshooting, and backup oxygen planning.

Final Thoughts

An oxygen concentrator is one of the most important devices used in long-term home oxygen therapy. It provides oxygen-enriched gas by removing nitrogen from room air, making it practical and cost-effective for many patients who need continuous low-flow oxygen.

However, safe use requires proper device selection, patient assessment, education, maintenance, and backup planning.

The patient must know how to respond to alarms, loss of flow, power failure, and equipment malfunction. When problems occur, the safest response is to switch to backup oxygen and contact the home-care provider.