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Right heart catheterization allows a surgeon to use a small, thin hollow tube called a catheter to examine your heart.

In a right-heart catheterization with heart tissue biopsy, tissue samples are taken directly from your heart muscle. Read on to learn details about this procedure.

You may need regular blood tests to keep track of how well you and your doctor are managing a condition, such as diabetes or high cholesterol.

Virtual colonoscopy (also known as CT colonography) is a procedure that is done to look for small polyps or other growths inside your colon. Read on to learn what to expect before, during, and after this procedure.

Proctectomy is a surgery to remove all or part of the rectum. It is often needed to treat rectal cancer.

This therapy targets the sympathetic nervous system, a series of nerves that spread out from your spine to your body to help control several body functions, including blood flow.

Acute bacterial rhinosinusitis (ABRS) is an infection of both your nasal cavity and sinuses. It's caused by bacteria. Here's what you need to know about this condition.

Aniridia is a serious and rare eye disorder in which the iris is partly or completely gone.

Aortic valve regurgitation is when a person's aortic valve leaks. The aortic valve is 1 of the heart's 4 valves. These valves help the blood flow through the heart and out to the body. Normally, the aortic valve stops blood from flowing back into the left ventricle. With aortic valve regurgitation, some blood leaks back through the valve as the heart relaxes.