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There are two main types of hyperbaric chambers: medical grade and non-medical grade, sometimes referred to as mild, or soft chambers. Medical grade chambers are FDA-approved for 14 medical conditions and can reach pressures of 3.0 ATA. Non-medical grade chambers are not FDA-approved and are not covered by insurance. These chambers only reach pressures up to 1.3 - 1.5 ATA and often do not include 100% medical grade oxygen delivery.

Hyperbaric oxygen therapy is an innovative medical treatment that involves patients breathing 100% oxygen at a higher-than-normal atmospheric pressure, delivered through a device called a hyperbaric chamber.

There are two types of chambers: medical grade and non-medical grade.  Another type device is  "mild," or “soft," chamber. These are non-medical grade. They differ in their delivery scope, use, and effectiveness. 

What Exactly is a Hyperbaric Chamber?

In short, a hyperbaric chamber is a pressurized vessel.

The amount of pressure applied during a treatment session depends on several factors specific to the patient, including the condition being treated and the patient’s response to treatment. Patients are treated either in an individual chamber, called a monoplace hyperbaric chamber, or in one that can hold several people, called a multiplace hyperbaric chamber. An alternative to a traditional monoplace chamber is a device called a "mild," or “soft," chamber.  However, it differs in its delivery scope, use, and effectiveness. 

Monoplace and multiplace hyperbaric chambers are FDA-approved for 14 different conditions, and many more indications have been or are currently being, studied using these chambers. Mild hyperbaric chambers, or "soft" chambers, are only FDA approved for Acute Mountain Sickness and have not been FDA approved for any other condition.

Medical Grade Chambers

These are the chambers we use at Hyperbaric Medical Solutions offices.

Inside medical grade hyperbaric oxygen chambers, patients breathe 100% medical grade oxygen, prescribed and supervised by a physician, at a specific atmospheric pressure for a designated amount of time. A specially trained hyperbaric technician monitors each patient from outside the chamber during treatment at all times. 

These devices are FDA approved. The Food and Drug Administration (FDA) currently recognizes HBOT for 14 conditions, which are generally covered by insurance.

HBOT may also have benefits for other conditions not yet approved by the FDA. Many of those conditions have undergone significant research and is commonly utilized around the globe. Treatment for conditions not yet approved by the FDA is generally not covered by insurance and is not available at hospital-based hyperbaric centers. The research on both the covered and non-covered conditions is based on the use of true medical grade hyperbaric chambers.

Monoplace Hyperbaric Chambers
Monoplace Hyperbaric ChamberPhoto Credit: Medical Expo

A monoplace hyperbaric chamber holds just one patient at a time. Lying inside a clear tube,




Multiplace Hyperbaric Chambers
Multiplace Hyperbaric ChamberPhoto Credit: Clife

Similar to a Hard Chamber, a multiplace hyperbaric chamber holds more than one patient at a time. 





Mild Hyperbaric Chambers
Soft Hyperbaric ChamberPhoto Credit: Rehab Mart

Mild hyperbaric chambers, otherwise known as "soft" hyperbaric chambers, are “bags” made of polyurethane or canvas material. These chambers reach a much lower pressure and only compress room air, which contains about 21% oxygen vs. the 100% medical grade oxygen used in a traditional medical grade hyperbaric chamber. These are not designed to be used with oxygen.

Despite these key differences, “soft chambers” are often marketed as effective as the medical grade chambers in a host of conditions, even if these claims have not been studied or proven.

Download our free eBook What is Hyperbaric Oxygen Therapy? to learn more about the healing powers of HBOT.


Written by Alan Katz, MD, FUHM, FACEP, FAAEM

Dr. Alan Katz, National Medical Director of Hyperbaric Medical Solutions (HMS), is double board certified in Emergency Medicine and Hyperbaric Medicine. He directs clinical operations, as well as education and research initiatives for HMS, particularly in exploring the use of hyperbaric oxygen therapy....

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