What is a hypoxia altitude simulation test (HAST)?
Our doctors may use the hypoxia altitude simulation test (HAST) to evaluate additional oxygen needs for patients who will be traveling by airplane.
During this test, you will first be seated in a chair. Then, a clear hood will be placed over your head. The hood will deliver a constant flow of oxygen through a tube, in order to simulate the oxygen level shifts during a flight.
Throughout the test, which lasts about 30 minutes, your oxygen level will be tested, in addition to your heart and respiratory rates.
HAST simulates a cabin pressure of 8,000 feet by asking a patient to breathe a mixture of gases with an oxygen concentration of 15.1 percent.