Serum alanine aminotransferase (SGPT) is the most abundant in the liver. When drugs damage the liver in the morning or in the acute phase of viral hepatitis, GPT is released into the blood due to liver cell damage, which makes the serum level of this enzyme increase obviously. Therefore, the determination of serum alanine aminotransferase activity can be used as an important index to diagnose liver diseases. The specific condition needs to be combined with your other indicators and symptoms to illustrate its specific significance.