Mark A. Rasmus MD


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…

Vital Capacity (VC)

Vital capacity (VC) measures the amount of air you can exhale after inhaling as deeply as possible. It is one of many lung function tests.

Arterial Blood Gas (ABG) Test

An arterial blood gas (ABG) test measures the levels of oxygen and carbon dioxide in the blood to find out how well the lungs are working. An ABG test checks how well the lungs can move oxygen into the blood and remove carbon dioxide from the blood. As blood passes through the lungs, oxygen moves into the blood while…

Arterial Blood Gas (ABG) Test

An arterial blood gas (ABG) test measures the levels of oxygen and carbon dioxide in the blood to find out how well the lungs are working. An ABG test checks how well the lungs can move oxygen into the blood and remove carbon dioxide from the blood. As blood passes through the lungs, oxygen moves into the blood while…

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…