How does the liver function test work?
The two chemical usually tested for are known as enzymes, specificly alanine aminotransferase (ALT) and aspartarte aminotransferase (AST). These enzymes should only be present in liver cells, if liver cells become damaged the enzymes leak into the blood stream. So measuring the ALT and AST levels in your blood gives a reliable indication of liver damage or disease. Until recently the only way to have a liver function test was (as stated above) by visiting your doctor, hospital or clinic. On the NHS the whole procedure can take many weeks, the test done privately usually cost over £400.
