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Why do doctors do Liver Function Tests?- By Dr harold Gunatillake Liver function tests are blood tests used to help diagnose and monitor liver disease or damage. The tests measure the levels of certain enzymes and proteins in your blood produced in your liver. Most diseases start due to damaged livers, and one could assess the damage through liver enzyme studies. The four warning signs of a damaged liver are: yellowing of the skin or whites of the eyes (jaundice), swelling in the legs, ankles and feet caused by a build-up of fluid (oedema) swelling in your abdomen caused by a build-up of fluid known as ascites. A high temperature and shivering attacks. So, your doctor will request a group of blood tests that provide information about the state of your liver. These tests include prothrombin time, activated partial thromboplastin time, albumin, bilirubin, and others, to assess the functions of ...