Practice Exam Questions And Correct

Certified Hyperbaric Technician (CHT) Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

1. The primary purpose of hyperbaric oxygen therapy (HBOT) is to:

• Increase red blood cell count
• Reduce nitrogen in the body
• Increase oxygen delivery to tissues
• Stimulate immune cell production

Rationale:

HBOT works by increasing the partial pressure of oxygen in the blood, enhancing oxygen delivery to tissues and promoting healing.

2. The typical pressure used in a monoplace hyperbaric chamber is:

A. 1 ATA 1 / 4

B. 2 ATA

C. 2.0–3.0 ATA

D. 4 ATA

Rationale:

Most monoplace chambers operate between 2.0 and 3.0 ATA to achieve therapeutic oxygenation safely.

• Which of the following is a contraindication for HBOT?
• Carbon monoxide poisoning
• Chronic non-healing wounds
• Untreated pneumothorax
• Diabetic foot ulcers

Rationale:

An untreated pneumothorax can expand under pressure and cause a life- threatening tension pneumothorax in the chamber.

4. The standard gas used in monoplace chambers is:

• Helium
• 100% Oxygen
• Nitrogen
• Air

Rationale:

Monoplace chambers are typically pressurized with 100% oxygen to maximize oxygen delivery to tissues. 2 / 4

• Which of the following is an absolute contraindication for HBOT?
• Mild sinus congestion
• Controlled asthma
• Untreated pneumothorax
• Claustrophobia

Rationale:

Untreated pneumothorax is an absolute contraindication because pressurization can cause lung collapse.

6. Barotrauma occurs due to:

• Low oxygen levels
• Pressure changes affecting gas-filled spaces
• Infection
• Dehydration

Rationale:

Barotrauma results from pressure differentials that affect air-containing cavities like the lungs, sinuses, and ears.

7. The therapeutic mechanism of HBOT in wound healing is primarily:

• Increasing nitric oxide production
• Increasing tissue oxygenation
• Stimulating bone marrow
• Reducing inflammation only 3 / 4

Rationale:

HBOT improves oxygen delivery to hypoxic tissues, promoting angiogenesis, fibroblast proliferation, and infection control.

8. The “oxygen window” refers to:

• The time oxygen is delivered
• The pressure gradient promoting inert gas elimination
• Oxygen saturation in blood
• Chamber inspection schedule

Rationale:

The oxygen window is the difference in partial pressures between oxygen in tissues and inert gases, facilitating nitrogen elimination.

9. A patient develops ear pain during descent. The likely cause is:

• Oxygen toxicity
• Middle ear barotrauma
• Anxiety
• Hypoxia

Rationale:

Middle ear barotrauma occurs when the Eustachian tube fails to equalize pressure during descent.

10. The main risk of 100% oxygen at high pressures is:

• Hypoxia
• Oxygen toxicity
• / 4