The six liver function tests include glutamic oxaloacetic transaminase, glutamic alanine transaminase, glutamic oxaloacetic transaminase ratio, total bilirubin, direct bilirubin and indirect bilirubin. When reviewing the six liver function tests, you should first observe whether the values of glutamic oxaloacetic transaminase, glutamic alanine transaminase, total bilirubin, direct bilirubin and indirect bilirubin exceed the normal range. Only when the values of these tests exceed the normal range can they be clinically significant, especially if the elevation is significant and exceeds twice the normal value, which is indicative of liver cell damage and problems with uptake, conversion and excretion by the liver. Glutathione-to-glutamic acid ratio is clinically significant only when the values of glutathione-to-transaminase and glutathione-to-alanine transaminase are abnormal. A decrease in the ratio of the two indicates relatively mild damage to liver cells, while a significant increase in the ratio of the two indicates serious liver damage and even the possibility of primary liver cancer. However, the results of liver function tests need to be combined with clinical symptoms and signs, and other related tests may also be needed to make a final assessment.