Test to measure different enzymes, proteins, and other substances made by the liver. You may need liver function testing if you have symptoms of liver disease. These include: - Jaundice, a condition that causes your skin and eyes to turn yellow - Nausea and vomiting - Diarrhea - Abdominal pain - Dark-colored urine - Light-colored stool - Fatigue You may also need these tests if you have certain risk factors. You may be at higher risk for liver disease if you: - Have a family history of liver disease - Have alcohol use disorder, a condition in which you have difficulty controlling how much you drink - Think you have been exposed to a hepatitis virus - Take medicines that may cause liver damage