Frequent and thorough handwashing is the best way to prevent infection.

Doppler ultrasound uses harmless sound waves to evaluate and create pictures of blood flow inside your blood vessels. This test can detect narrow or blocked arteries and veins due to an abnormality pressing on them or blood clots inside.

An inhaler is a pressurized sprayer that delivers a measured amount of medicine. Follow these steps if you're using an inhaler.

A TIA (transient ischemic attack) is an early warning that a stroke (also called a brain attack) is coming. A TIA is a temporary stroke. It causes no lasting damage. But the effects of a stroke, if it happens, can be very serious and lasting. Here are symptoms to watch for.

A bone scan is an imaging test that uses a special camera to form images of your bones. Learn why it's done, how to get ready for it, and what to expect before, during, and after the test.

A bone density study helps diagnose osteoporosis (bone thinning). Scans of your lower back, hip, or forearm are taken to measure the amount of calcium (density) in your bones. Calcium is the mineral that makes up your bones.

A barium enema is an X-ray exam of your rectum and colon. This test helps your doctor find problems, such as blockages or polyps.

You are scheduled to have surgery. The health care staff will try to make your stay comfortable. Use the guidelines below to remind yourself what to do before surgery.

Blood lost during surgery may need to be replaced. Donating your own blood ahead of time is sometimes best. Depositing your own blood before surgery is called autologous blood donation.

Your anesthesiologist gives you anesthetics (medicines to keep you comfortable and decrease your awareness of surgery) and monitors your condition to keep you safe during surgery. You will have one of three kinds of anesthesia during your surgery.