This test measures the amount of folate in either your serum or your red blood cells.

This test measures the amount of fluphenazine in your blood. This medicine is used to treat schizophrenia and Tourette's syndrome.

This test measures the amount of a protein made during pregnancy. It can help your doctor know if you are at risk for premature delivery.

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.