Oxygen Chamber Therapy: How It Works, Types, Cost, and What to Expect

Oxygen chamber therapy is another name for hyperbaric oxygen therapy (HBOT), a medical treatment that delivers 100% oxygen at pressures higher than normal atmospheric levels. Inside a pressurized chamber, your body absorbs far more oxygen than it could ever take in at sea level. That extra oxygen dissolves directly into your blood plasma, cerebrospinal fluid, and tissues, reaching areas that red blood cells alone cannot.

The treatment has been used in clinical medicine since the 1940s. Today, it holds FDA clearance for 14 specific medical conditions and is being studied for dozens more. Whether you are recovering from a non-healing wound, dealing with radiation injury, or exploring off-label applications, this guide covers what oxygen chamber therapy is, how it works, what the evidence says, and what it costs.

What Is Oxygen Chamber Therapy?

Oxygen chamber therapy places a patient inside an enclosed, pressurized vessel while they breathe pure oxygen. The chamber is pressurized to levels between 1.5 and 3.0 atmospheres absolute (ATA), which is 50% to 200% higher than normal sea-level pressure.¹

At sea level (1.0 ATA), hemoglobin in your red blood cells carries about 97% of the oxygen in your blood. Only a small fraction dissolves directly in plasma. When you step into a hyperbaric chamber pressurized to 2.0 or 2.5 ATA and breathe 100% oxygen, the amount of dissolved oxygen in your plasma increases dramatically.

This is not a new concept. The Undersea and Hyperbaric Medical Society (UHMS) has maintained treatment protocols and clinical standards for HBOT since the 1960s. The treatment is administered in hospitals, standalone HBOT clinics, and wound care centers across the United States.

How It Works: Henry’s Law and Dissolved Oxygen

The science behind oxygen chamber therapy comes down to a basic gas law. Henry’s Law states that the amount of gas dissolved in a liquid is proportional to the pressure of that gas above the liquid. When you increase pressure inside a chamber while breathing pure oxygen, more oxygen dissolves into your blood plasma.

Under normal conditions, arterial blood carries about 0.3 mL of dissolved oxygen per deciliter. At 3.0 ATA breathing 100% oxygen, that number rises to approximately 6.0 mL per deciliter, a 20-fold increase.² This dissolved oxygen can reach tissues that compromised red blood cells cannot access, including areas with damaged blood vessels, swollen tissues, or restricted circulation.

A 2024 review in the International Journal of Molecular Sciences confirmed that HBOT generates hyperoxia by increasing dissolved oxygen in the blood, with downstream effects on mitochondrial function, angiogenesis (new blood vessel formation), and reduction of inflammatory markers.³

“At 2.5 ATA, dissolved plasma oxygen increases from 0.3 mL/dL to approximately 5.6 mL/dL, enough to sustain basic tissue metabolism without hemoglobin.”
Schottlender et al., Biomolecules, 2021

Types of Hyperbaric Chambers

There are three main types of oxygen chambers used in clinical and home settings.

Monoplace Chambers

A monoplace chamber holds one patient at a time. The patient lies inside a clear acrylic tube while the entire chamber is pressurized with 100% oxygen. These are the most common chambers in hospitals and outpatient wound care centers. They can reach pressures of 3.0 ATA and deliver the full range of FDA-cleared protocols.⁴

Multiplace Chambers

A multiplace chamber can hold two or more patients along with a medical attendant. The chamber itself is pressurized with compressed air, and patients breathe 100% oxygen through a hood or mask. These are found in large medical centers and military facilities. The advantage is that a trained attendant can be inside the chamber to provide hands-on care during treatment.

Soft-Shell (Mild Hyperbaric) Chambers

Soft-shell or portable chambers are designed for home use. They are made of flexible, reinforced fabric and typically reach pressures of only 1.3 to 1.5 ATA. Most use ambient air (21% oxygen) or require a separate oxygen concentrator. Because they operate at lower pressures and often without 100% oxygen, the increase in dissolved oxygen is significantly less than clinical hard-shell chambers.

These are not FDA-cleared for any medical condition. They are sold as wellness devices. If you want to learn more about chamber types and what to look for, see our guide on what is a hyperbaric chamber.

Pressure Levels and Session Protocol

A standard HBOT session follows a consistent protocol regardless of the condition being treated:

1. Compression (10-15 minutes): The chamber pressure gradually increases to the target ATA. Patients equalize ear pressure during this phase, similar to ascending in an airplane.
2. Treatment (60-90 minutes): The patient breathes 100% oxygen at the prescribed pressure. Most protocols use 2.0 to 2.5 ATA. Some emergency conditions like gas embolism use up to 2.8 ATA.
3. Decompression (10-15 minutes): Pressure slowly returns to normal. Total time in the chamber is typically 90 to 120 minutes.

Most treatment plans involve 20 to 40 sessions, scheduled once or twice daily, five days per week. Acute conditions like carbon monoxide poisoning may require only one to five sessions. Chronic wound care protocols typically call for 30 to 40 sessions.⁴

14 FDA-Cleared Indications for HBOT

The FDA has cleared hyperbaric oxygen therapy for the following 14 conditions, which are also recognized by the Undersea and Hyperbaric Medical Society (UHMS):⁵

1. Air or gas embolism
2. Carbon monoxide poisoning
3. Clostridial myositis and myonecrosis (gas gangrene)
4. Crush injuries, compartment syndromes, and other acute traumatic ischemias
5. Decompression sickness
6. Arterial insufficiencies (central retinal artery occlusion, enhancement of healing in selected problem wounds)
7. Severe anemia (when transfusion is not an option)
8. Intracranial abscess
9. Necrotizing soft tissue infections
10. Osteomyelitis (refractory)
11. Delayed radiation injury (soft tissue and bony necrosis)
12. Compromised grafts and flaps
13. Acute thermal burn injury
14. Idiopathic sudden sensorineural hearing loss

For these conditions, HBOT is typically covered by insurance when prescribed by a physician and administered at an accredited facility.

Evidence for Off-Label Use

Beyond the 14 FDA-cleared indications, researchers are studying HBOT for a wide range of conditions. The evidence varies significantly:

Traumatic Brain Injury (TBI)

A 2025 study in Frontiers in Medicine found that HBOT at 2.0 ATA significantly improved outcomes in patients with traumatic brain injury by increasing dissolved oxygen delivery to damaged neural tissues.⁶ Multiple clinical trials are ongoing, though results remain mixed.

Post-COVID Syndrome

A 2022 randomized controlled trial published in Scientific Reports showed that 40 sessions of HBOT at 2.0 ATA improved cognitive function, energy levels, and sleep quality in patients with post-COVID cognitive symptoms.⁷

Stroke Recovery

Research published in Biomolecules in 2021 demonstrated that HBOT could enhance neuroplasticity and cerebral blood flow in chronic stroke patients, even years after the initial event.²

Fibromyalgia

An Israeli study found that 40 HBOT sessions reduced pain and improved quality of life scores in women with fibromyalgia. The proposed mechanism involves reducing neuroinflammation and improving oxygen delivery to sensitized neural pathways.

It is worth noting that off-label use of HBOT is almost never covered by insurance. Patients pay out of pocket, which is a significant consideration given the number of sessions typically required.

Oxygen Chamber Therapy Cost

The cost of HBOT varies widely depending on the setting and whether insurance covers your specific condition.

For a typical 40-session protocol at $200 per session, the total out-of-pocket cost is $8,000. Many clinics offer package pricing or financing. For a deeper breakdown, see our full guide on hyperbaric chamber cost.

Finding a Provider

Not all hyperbaric facilities are equal. Here is what to look for:

• Accreditation: Look for facilities accredited by the UHMS or the Accreditation Council for Clinical Hyperbaric Medicine.
• Physician oversight: Treatment should be prescribed and supervised by a physician trained in hyperbaric medicine.
• Hard-shell chambers: For FDA-cleared indications, you need a clinical-grade monoplace or multiplace chamber, not a soft-shell unit.
• Emergency protocols: The facility should have protocols for managing oxygen toxicity seizures and other rare complications.
• Transparent pricing: Ask for the full cost of the recommended protocol before starting treatment, including the number of sessions.

If you are considering a home chamber, see our review of the best hyperbaric chambers for personal use.

Risks and Side Effects

HBOT is considered safe when administered by trained professionals at standard pressures. The most common side effects include:

• Ear and sinus barotrauma: Pressure changes can cause ear pain or sinus discomfort. Equalization techniques usually prevent this.
• Temporary myopia: Some patients experience short-term nearsightedness that resolves within weeks after completing treatment.
• Oxygen toxicity: Extremely rare at clinical pressures. Risk increases above 2.8 ATA or with sessions exceeding 120 minutes.
• Claustrophobia: Monoplace chambers can trigger anxiety in some patients. Multiplace chambers or sedation may help.

Serious complications like pneumothorax or seizures from oxygen toxicity are very rare, occurring in less than 0.01% of treatments.⁴

Frequently Asked Questions

Is oxygen chamber therapy the same as HBOT?

Yes. Oxygen chamber therapy is simply another name for hyperbaric oxygen therapy (HBOT). Both terms refer to breathing 100% oxygen in a pressurized chamber.

How many sessions do I need?

It depends on the condition. Acute emergencies (carbon monoxide poisoning, decompression sickness) may need 1 to 5 sessions. Chronic wounds and radiation injury typically require 30 to 40 sessions. Off-label conditions usually follow 20 to 40 session protocols.

Does insurance cover oxygen chamber therapy?

Insurance covers HBOT for the 14 FDA-cleared indications when prescribed by a physician. Off-label use is almost always out of pocket. Medicare covers HBOT for diabetic wounds and a few other approved conditions.

Can I use a home chamber instead of going to a clinic?

Home chambers (soft-shell) operate at much lower pressures (1.3-1.5 ATA) and typically use ambient air, not 100% oxygen. They are not equivalent to clinical HBOT. For FDA-cleared indications, a clinical chamber is required. Home chambers may be appropriate for general wellness, but the evidence for therapeutic benefit at mild pressures is limited.

Bottom Line

Oxygen chamber therapy is a well-established medical treatment with strong evidence for its 14 FDA-cleared indications. The science is straightforward: pressurized oxygen dissolves into your plasma at levels far beyond what normal breathing can achieve, reaching tissues that need it most. For FDA-cleared conditions, it is covered by insurance and delivered in accredited facilities. For off-label use, the evidence is growing but insurance coverage is unlikely, so plan for out-of-pocket costs of $4,000 to $12,000 for a full protocol.

1. Ortega MA, Fraile-Martinez O, Garcia-Montero C, et al. A General Overview on the Hyperbaric Oxygen Therapy: Applications, Mechanisms and Translational Opportunities. Medicina (Kaunas). 2021;57(9):864. doi:10.3390/medicina57090864
2. Schottlender N, Gottfried I, Bhutani S, et al. Hyperbaric Oxygen Treatment: Effects on Mitochondrial Function and Oxidative Stress. Biomolecules. 2021;11(12):1827. doi:10.3390/biom11121827
3. Cannellotto M, Duarte A, Keller G, et al. Hyperbaric Oxygen as Adjuvant Therapy in Chronic Disease: Molecular Mechanisms and Clinical Practice. Int J Mol Sci. 2024;25(2):777. doi:10.3390/ijms25020777
4. Moon RE. Hyperbaric oxygen therapy indications. 14th Edition. Undersea and Hyperbaric Medical Society; 2019.
5. U.S. Food & Drug Administration. Hyperbaric Oxygen Therapy: Don’t Be Misled. FDA Consumer Update. 2021. Available at: fda.gov/consumers/consumer-updates/hyperbaric-oxygen-therapy-get-facts
6. Fang J, Li Y, Zhang K, et al. Hyperbaric Oxygen Therapy in Rheumatic and Immune Diseases. Front Med. 2025;12:1706637. doi:10.3389/fmed.2025.1706637
7. Zilberman-Itskovich S, Catalogna M, Sasson E, et al. Hyperbaric oxygen therapy improves neurocognitive functions and symptoms of post-COVID condition: randomized controlled trial. Sci Rep. 2022;12(1):11252. doi:10.1038/s41598-022-15565-0

Seph Fontane Pennock

Author

Seph Fontane Pennock is the founder of BaricBoost.com and Regenerated.com, a clinic directory for regenerative medicine serving 10,000+ providers across the United States. He previously built and sold PositivePsychology.com, which grew to 19 million users and became the largest evidence-based positive psychology resource on the web. Seph brings direct experience as an HBOT patient, having completed protocols at clinics across three continents while navigating mold illness, systemic inflammation, and autoimmune conditions. His treatment journey includes hyperbaric oxygen therapy, peptide protocols, NAD+ therapy, and consultations with specialists from Dubai to Cape Town to Mexico. This combination of entrepreneurial track record and lived patient experience shapes everything published on BaricBoost.com. Every article is grounded in peer-reviewed research, informed by real clinical encounters, and written for patients making high-stakes treatment decisions. Seph's focus is on bringing transparency, scientific rigor, and practical guidance to the hyperbaric oxygen therapy space.

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