The direct antiglobulin test, or direct Coombs test, is a blood test used to diagnose a type of anemia caused by your immune system.

This test measures the level of diphtheria antibodies in your blood. You may need this test to find out whether you have or are at risk for diphtheria.

This test measures the amount of the heart medicine digoxin in your blood. When you take digoxin, it's important that the medicine be at the right level for you to benefit from it.

This blood test checks for substances called antibodies. These are made by your body in response to insulin and other chemicals related to insulin. It is used to find out whether you have type 1 or type 2 diabetes.

This test measures the level of DHEA and DHEA-S in your blood. It may also be used to check how well your adrenal glands are working.

This test helps your healthcare provider find out whether you have celiac disease, an autoimmune disorder.

This test is used to rule out whether you have a blood clot. When blood clots form and start to break down, they release the substance D-dimer into the blood.

This test looks for cytomegalovirus, a common virus that belongs to the herpes family. Your healthcare provider might order the test if you have unexplained symptoms that resemble the flu.

This test looks for antibodies to cytomegalovirus (CMV), a virus in the herpes family, in your blood.

This test checks the amniotic fluid around a developing baby for cytomegalovirus, a virus that belongs to the herpes family of viruses.