This test measures the amount of thyroid antibodies in your blood. The test can help find out whether you have a problem with your thyroid.

This test measures the level of the medicine theophylline in your blood. Having too much of this medicine in your body can be life-threatening.

This test measures the level of testosterone in your blood. Both men and women make this hormone.

This test measures both your total and free testosterone levels. Having levels that are too high or too low can cause health problems.

This test screens for tuberculosis by looking for the bacteria in the sputum, urine, or cerebrospinal fluid.

This test checks for antibodies that are a sign of Sjogren syndrome, an autoimmune disease that makes it hard for your glands to make enough moisture.

This is a series of tests that looks at how healthy your semen and sperm are.

This test looks for salmonella bacteria in your stool. Having these bacteria in your stool means you have a salmonella infection.

This test finds out if you have been exposed to the virus that causes measles, an extremely contagious disease.

This stool test is used to diagnose a rotavirus infection, which causes vomiting and diarrhea.