High Altitude Simulation Testing
Your doctor has suggested you have a High Altitude Simulation Test as part of the evaluation at National Jewish Health. A High Altitude Simulation Test (HAST) is a test to determine if you need supplemental oxygen when you fly on an airplane or go to a higher altitude.
The standard order is for a simulated altitude of 8,000 feet, which is the same atmospheric pressure as the cabin of a commercial airplane. This is not a barometric chamber but rather simulating various altitudes. Other altitudes can be simulated (E.g. Aspen, etc.) if ordered by your health care provider.
This test will help your doctor determine the best treatment for you.
Preparing for the Test
Wear comfortable clothes.
Take your medication as you usually do.
During the Test
The technician will explain what you need to do during each test. If you have questions during the tests, please ask the technician.
You will do some spirometry breathing tests.
Your oxygen level will be monitored with a pulse oximeter on your finger.
You may also have an arterial line placed in your wrist to measure your oxygen level during the test.
Once these monitors are in place, you will breath into a mask for about 20 minutes while we measure your oxygen level. Based on these results you may breathe into a mask for another 20 minutes while inhaling oxygen through a nasal cannula.
Length of the Test
The HAST test often takes 2 hours to complete, although sometimes people stay longer.
Day of the Test
On the day of your scheduled test, report to room A310a in the Pulmonary Physiology Service (PPS). PPS is located on the 3rd floor of the May building. If you have questions please call the Pulmonary Physiology Unit at 303.398.1530.
This information has been approved by Amy L. Olson, MD, MSPH and Becky Kolenbrander, RRT, RPFT, AE-C (October 2014).