Mark A. Rasmus MD


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…

Sleep and Your Body Clock

What is the body clock? The body’s “biological clock,” or 24-hour cycle ( circadian rhythm ), can be affected by light or darkness, which can make the body think it is time to sleep or wake up. The 24-hour body clock controls functions such as: Sleeping and waking. Body temperature. The body’s immune system. Other body…

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.

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…

Medicine or Other Drug Use and Sleep Problems

Many prescription and nonprescription medicines can cause sleep problems. A few examples of these medicines are: Antidepressants. Cold medicines. Steroid medicines. Nonprescription diet aids. Other substances Other substances that may cause sleep problems include: Alcohol. At first, drinking alcohol may cause…