This blood test finds out if you are abnormally making or losing protein or whether you are having problems absorbing protein.

This test finds out if you have DNA from the herpes simplex virus in your nervous system. It can help diagnose encephalitis and meningitis.

This test looks for the virus that causes genital warts and cervical, throat, and anal cancer.

This test measures levels of homocysteine in your blood. At high levels, it can damage the lining of arteries and encourage blood clotting.

This test looks for a certain protein made by your immune system. The test can help tell whether you have an autoimmune disease.

This test looks at the human leukocyte antigens (HLAs) in your blood. It helps match donors and recipients for stem cell and organ transplants.

This test looks for a certain antibody made by your immune system. The test is done if you need an organ transplant.

This test measures the amount of HIV in your blood. HIV causes AIDS, and this test is used to see how well your HIV treatment is working.

This test looks for HIV infection in your blood or saliva. It can give you results in about 20 minutes.

This blood test looks at the genetic makeup of a strain of HIV, the virus that causes AIDS. The test can be useful in planning your treatment for HIV.