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.

Thrombin time measures how long the blood's plasma, or the liquid portion of the blood, takes to form a clot.

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

This test looks for tetanus antibody in your blood. If you have been vaccinated for tetanus in the past, this test should show that you have enough antibodies against the disease.

This test measures the level of testosterone in your blood. You may need this test if your doctor thinks you have low or high testosterone.

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 measures the amount of carbamazepine in your blood. Carbamazepine is the generic name of tegretol, a medicine used to treat epilepsy, mania, bipolar disorder, and pain.

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

This test measures the level of triiodothyronine (T3) in your blood. T3 is a type of hormone made by your thyroid gland.

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.