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Liver function tests are a group of blood tests that help evaluate how well the liver is working and detect potential liver damage or disease. These tests measure various enzymes, proteins, and substances that the liver produces or processes. Common liver function tests include alanine aminotransferase (ALT), aspartate aminotransferase (AST), alkaline phosphatase (ALP), albumin, bilirubin, and total protein. Healthcare providers often order these tests as part of routine health screenings, to monitor existing liver conditions, or when symptoms suggest possible liver problems.

Elevated levels of liver enzymes like ALT and AST typically indicate liver cell damage or inflammation. ALT is found mainly in the liver, so increased levels are more specific to liver problems. AST is present in the liver and other organs including the heart and muscles, so elevated levels may suggest issues beyond the liver. Alkaline phosphatase is an enzyme related to the bile ducts, and high levels may indicate bile duct obstruction or bone disorders. These enzyme measurements help doctors identify the type and severity of liver dysfunction.

Bilirubin is a yellowish substance produced when red blood cells break down, and the liver normally processes and eliminates it. High bilirubin levels can cause jaundice, a yellowing of the skin and eyes, and may indicate liver disease, bile duct problems, or certain blood disorders. Albumin is a major protein made by the liver that helps maintain fluid balance in the body. Low albumin levels may suggest chronic liver disease or malnutrition. Total protein measures albumin and other proteins in the blood, providing additional information about liver and kidney function.

Preparation for liver function tests usually requires fasting for eight to twelve hours before the blood draw, though specific instructions may vary depending on which tests are ordered. Certain medications, supplements, and herbal products can affect test results, so patients should inform their healthcare provider about everything they are taking. Results outside the normal range do not always indicate serious liver disease, as various factors including medications, recent meals, strenuous exercise, or temporary conditions can influence levels. Healthcare providers interpret results in the context of symptoms, medical history, and other diagnostic information to determine if further evaluation or treatment is necessary.