This test measures the amount of a substance called carnitine in your blood. Carnitine makes it possible for your body to digest fatty acids.

This test helps your healthcare provider diagnose clotting disorders and autoimmune diseases. It measures the concentration of antibodies related to a fat molecule in your blood.

This test measures the levels of cardiac biomarkers in your blood. Some of these markers increase after you've had a heart attack.

This test measures a protein called carcinoembryonic antigen (CEA) in your blood. This protein is present on some types of cancer cells.

This test measures the amount of carbon dioxide in your blood. Normally, carbon dioxide in your bloodstream causes no problems, but if you have far too much or too little of it, you may have a disease or a medical emergency.

This is a 2-part test to look for THC in your urine. THC is the active ingredient in marijuana.

This test looks for harmful bacteria called Campylobacter in a culture sample from a bowel movement (stool).

This test measures the level of calcium in your urine. If too much calcium builds up in your urine, you may be at risk for kidney stones.

This test measures the amount of calcium in your blood. It can be used to diagnose many conditions, such as kidney disease.

This blood test measures the level of calcitonin in your blood. Calcitonin is a hormone made by your thyroid gland.