Mark A. Rasmus MD


Lung Function Tests

Lung function tests (also called pulmonary function tests) are done to check how well your lungs are working. The test may be done to find the cause of breathing problems, diagnose lung diseases, or find out how well treatment for a lung problem is working. There are many types of lung function tests. Spirometry…

Oxygen Saturation

Oxygen saturation refers to the amount of oxygen being carried in the red blood cells, which load up with oxygen in the lungs and then transport it to the rest of the body. People who have medical conditions, such as lung disease, may not have enough oxygen in their red blood cells. Oxygen saturation can be measured by…

Residual Volume (RV)

Residual volume is the amount of air that remains in a person’s lungs after fully exhaling. Doctors use tests to measure a person’s residual air volume to help check how well the lungs are functioning. It is normal to have some air remain after exhaling to keep the lungs from collapsing. Residual volume is measured by…

Total Lung Capacity

Total lung capacity (TLC) is the maximum amount of air the lungs can hold when they are fully inflated. This amount can be measured as part of lung function tests. To measure total lung capacity, a person sits inside a booth called a plethysmograph and breathes through a mouthpiece while pressure and air flow…

Oxygen Saturation

Oxygen saturation refers to the amount of oxygen being carried in the red blood cells, which load up with oxygen in the lungs and then transport it to the rest of the body. People who have medical conditions, such as lung disease, may not have enough oxygen in their red blood cells. Oxygen saturation can be measured by…