Autoimmune Hepatitis Markers
Autoimmune hepatitis is a chronic condition caused by the body's immune system attacking healthy liver cells and causing damage to the liver. It can be difficult to diagnose, as there are no specific or reliable tests to identify it. However, there are certain markers that can be used to help diagnose autoimmune hepatitis.
Liver Function Tests
Liver function tests are used to measure levels of enzymes in the blood, which can help diagnose autoimmune hepatitis. Elevated levels of two enzymes, aspartate aminotransferase (AST) and alanine aminotransferase (ALT), may be indicative of autoimmune hepatitis. High levels of gamma-glutamyltransferase (GGT) and alkaline phosphatase (ALP) may also be present.
Autoantibodies
Autoantibodies are proteins produced by the immune system that attack healthy cells. In autoimmune hepatitis, the body produces antibodies against its own liver cells. The most common autoantibodies associated with autoimmune hepatitis are antinuclear antibodies (ANA) and anti-smooth muscle antibodies (SMA).
Elevated Serum Immunoglobulins
Autoimmune hepatitis often causes elevated levels of serum immunoglobulins, which are proteins that help fight infection. Specifically, elevated levels of IgG, IgM, and IgA are usually present in people with autoimmune hepatitis.
Liver Biopsy
A liver biopsy, or the removal of a small sample of liver tissue for examination, may be used to confirm a diagnosis of autoimmune hepatitis. During the biopsy, the doctor will look for signs of inflammation, fibrosis, and cirrhosis.