The GGT value of liver cancer is usually around 400U/L or 500U/L, that is, around 10 times of the upper limit of normal value, but the GGT value can not confirm the diagnosis of liver cancer, and pathologic biopsy is needed to confirm the diagnosis. GGT refers to gamma-glutamyl transpeptide in the blood. Under normal conditions, the level of GGT is below 40-50 U/L, and in primary or metastatic liver cancer, the GGT in the blood is obviously elevated. The reason is that the increase of GGT produced by cancer cells and the stimulating effect of inflammation in the cancer tissues themselves or their surroundings increase the permeability of the liver cell membrane, so that the GGT in blood increases. Obstructive jaundice, acute hepatitis, active chronic hepatitis, biliary tract infections, and cirrhosis of the liver can increase GGT. Other diseases such as myocardial infarction, acute pancreatitis and certain drugs can also increase GGT in blood. Therefore, GGT is only used as an indicator to assist in the diagnosis of liver cancer, and the diagnosis of liver cancer needs to be combined with other laboratory tests, imaging tests and pathologic tests to make a comprehensive judgment. When GGT level is found to be elevated, one should go to the hospital in time for liver ultrasound or pathological examination to further clarify whether there is liver cancer or not, so as to avoid delaying the condition.