This test measures the amount of potassium in your blood. It's often part of a routine blood test to check your level of electrolytes.

A cocaine screen is a test done to find out whether you have used cocaine recently. The test can be done on your urine, saliva, blood, hair, or sweat.

This test looks for signs of chemical poisoning in your blood. You may need this test if your doctor thinks you have been overexposed to insecticides.

This test measures the amount of cholesterol in your blood to help determine your risk for heart disease.

This test measures the amount of chloride in your urine. Knowing your chloride level is useful if you have a condition called metabolic alkalosis.

This test measures the levels of catecholamines in your blood. The catecholamine hormones are adrenaline (epinephrine), norepinephrine, and dopamine.

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.