Liver Blood Tests Topic Guide

Liver blood tests are used to check the levels and function of liver enzymes in the blood called AST and ALT or aminotransferases in the blood. Symptoms of elevated or high liver enzymes in the blood include fever, abdominal pain, poor appetite, itching, and nausea.

Normal levels of liver enzymes in blood are caused by liver diseases caused by drugs, for example, acetaminophen (Tylenol), pain medications, and statins. Less common causes of abnormal levels of ALT or AST levels in the blood are alcoholic and non-alcoholic liver diseases (NASH), hepatitis, and alcoholism.

Normal levels of ALT ranges from about 7-56 units/liter, and 10-40 units/liters for AST. Elevated (high) and low liver enzymes elevated levels of AST and ALT may signify the level of liver damage the person has. A blood sample is sent to the laboratory for measurement. Usually, you doctor will have the results interpreted within a few hours to days.

Liver blood tests are used to check normal, elevated (high), and low blood levels of liver enzymes (AST and ALT or aminotransferases). Symptoms of elevated levels of liver enzymes are fever, abdominal pain, poor appetite, and nausea. Drugs, for example, acetaminophen (Tylenol), pain drugs, and statins caused high levels of liver enzymes. Less common causes are NASH, hepatitis, and alcoholism.