This test looks for a substance that can appear in your blood if you have hairy cell leukemia.

This test measures the level of the hormone thyroxine (T4) in your blood. This test can show your healthcare provider whether your thyroid gland is overactive (hyperthyroidism) or underactive (hypothyroidism).

This test looks for antibodies that your body made when in fighting off group A Streptococcus bacteria. These bacteria cause strep throat.

This test looks for white blood cells in your stool. This can help your healthcare provider figure out what's causing inflammatory diarrhea.

This test measures the amount of sodium, or salt, in your urine. This test can help your healthcare provider find out whether you have too much salt in your diet.

Rh typing is very important during pregnancy. If you are Rh negative and your baby is Rh positive, you may have an Rh incompatibility.

This test looks for antibodies to red blood cells (RBCs) in your blood. These antibodies can cause problems during blood transfusions or, if you're pregnant, with your unborn baby.

This test looks for signs of syphilis, a sexually transmitted disease that can cause serious health problems if not treated.

This test is 1 of several that looks at how well your blood clots. Your healthcare provider may use this test to help diagnose a blood clotting disorder.

This test measures levels of protein S, a protein in the blood that helps it to clot.