This test measures how much iron is in your blood. Too much or too little iron can cause health problems.

A fecal occult blood test checks a stool sample for blood that can't be seen with the naked eye. Blood in the stool is a sign of bleeding in the digestive tract.

This test measures the amount of fat in your stool. Having too much fat in your stool may mean that you have malabsorption.

This test measures the amount of a protein called coagulation factor XII in your blood. Factor XII is one of several clotting factors.

This test measures the amount of factor XI in your blood. Factor XI is a substance that plays an important role in blood clotting.

This test looks for certain antibodies in your blood that may mean you have celiac disease, an autoimmune disease.

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 toxic chemicals in your blood. These chemicals are most often found in insecticides, either those used in fields or those used in bug sprays.

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.