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This test looks for a protein in your blood that may mean that you have liver cancer or one of several other cancers.

This is a 2-part test to look for THC in your urine. THC is the active ingredient in marijuana.

Calcium is a mineral that helps us make strong bones and teeth. We spend 25 to 30 years building to a peak bone mass. Taking in enough calcium helps younger people build strong bones. Maintaining a safe calcium level helps older people limit bone loss.

Cervical spine problems can often be treated without surgery. Choices may include rest, medicines, or injections. Your doctor may also suggest certain exercises. All these treatments may help to ease your symptoms and are often successful.

Doctors commonly leave this drain within the abdominal cavity after surgery. It helps prevent swelling and reduces the risk for infection. The tube is held in place by a few stitches. It is covered with a bandage. Your doctor will remove the drain when he or she determines you no longer need it.

Learn about common respiratory infections, such as colds and the flu, and what you can do to prevent them.

Here are images that show the steps of hand washing.

Here are images that show the steps for putting on sterile gloves.

The steps to giving yourself an insulin shot are illustrated here.