Glutamyl transpeptidase 90 U/L is not normal. In general, the normal range for glutamyl transpeptidase is 11 to 50 U/L in men and 7 to 32 U/L in women, and this parameter is often used as an adjunctive test for diseases of the hepatobiliary system. Glutamyl transpeptidase 90 U/L is high. Elevated glutamyl transpeptidase is commonly seen in primary biliary cholangitis, alcoholic liver disease, cirrhosis, hepatitis, etc. It needs to be differentiated in combination with CT and other tests. It is worth noting that some pancreatitis, kidney disease and other systemic diseases can also be seen in elevated glutamyl transpeptidase, if the long-term high protein diet will also have an impact on the results of this test. In daily life, we need to quit smoking and drinking, regular work and rest, and develop good living habits. Promptly diagnose and treat any discomfort.