Liver function tests are used to detect liver damage or disease. Combinations of up to five tests are measured at the same time on a blood sample. These are selected from:
- Alanine aminotransferase (ALT) – an enzyme mainly found in the liver; the best test for detecting hepatitis
- Alkaline phosphatase (ALP) – an enzyme related to the bile ducts; often increased when they are blocked
- Aspartate aminotransferase (AST) – an enzyme found in the liver and a few other places, particularly the heart and other muscles in the body
- Total bilirubin – measures all the yellow bilirubin pigment in the blood. Another test, direct bilirubin, measures a form made in the liver and is often requested with total bilirubin in infants with jaundice.
- Albumin – measures the main protein made by the liver and tells how well the liver is making this protein
- Total protein - measures albumin and all other proteins in blood, including antibodies made to help fight off infections
When are these tests requested?
These tests are used when symptoms suspicious of a liver condition are noticed. These include: jaundice, dark urine and light-coloured bowel movements; nausea, vomiting and diarrhoea; loss of appetite; vomiting of blood; bloody or black bowel movements; swelling or pain in the belly; unusual weight change; or fatigue or loss of stamina. One or more of these tests may be requested when a person has been or may have been exposed to a hepatitis virus; has a family history of liver disease; has excessive alcohol intake; or is taking a drug that can cause liver damage.
http://www.labtestsonline.org.uk/understanding/analytes/liver_panel/glance.html
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