This is a blood test for a specific aspect of liver metabolism. The ability to excrete bile pigments is measured by determining the serum bilirubin level; the levels of serum enzymes such as the aminotransferases aspartate (AST) and alanine (ALT) may be used to assess damage to the liver cells and biliary tract obstruction or dysfunction.
Levels of the serum proteins albumin and globulin and their ratio are used to judge the synthetic functions of the liver. Certain clotting factors are also synthesized in the liver, and abnormalities may indicate impairments in hepatic synthesis.
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