This test measures the amount of a drug called amphetamine in your blood. The test is most often used to screen for drug abuse.

This test is done to see how well your baby is developing inside you.

This test checks for the chemical oxalate in your blood. High levels of this substance can make it more likely that you will develop kidney stones.

This test looks for parasites and their larvae or eggs in a sample of your stool.

This test measures the concentration of particles in your urine. It finds out if your electrolyte balance is normal and if your kidneys are working correctly.

This test measures the concentration, or osmolality, of certain particles in a sample of your watery stool. The test is used to find out why you have chronic diarrhea.

This test measures the concentration of dissolved particles, or osmolality, in your blood.

This test measures cotinine, a chemical your body makes after exposure to nicotine.

This test measures a protein called myoglobin in your urine. The test can help find out if your muscle tissue has been injured.

This test measures the amount of a protein called myoglobin in your blood. It's done to help diagnose conditions caused by muscle damage.