The normal values for alkaline phosphatase are 45-125 U/L for men and 30-100 U/L for women, and there is no need to panic about high alkaline phosphatase in pregnant women, as it is generally a normal physiological phenomenon. The main causes of elevated alkaline phosphatase are: 1) the fetal skeletal system releases a certain amount of alkaline phosphatase into the mother during fetal growth and development; 2) the placenta synthesizes and releases a certain amount of alkaline phosphatase; 3) during pregnancy, if you eat too much food with high fat content, it can also lead to elevated alkaline phosphatase. Usually in the 9th month of pregnancy, the alkaline phosphatase value reaches about 2-3 times the usual level. It is also seen in a small number of abnormal causes including the following: 1. Increased blood volume during pregnancy, which increases the burden on the heart, lungs and liver; 2. Overproduction of hepatocytes in the case of obstructive jaundice, primary liver cancer, secondary liver cancer and cholestatic hepatitis, which enters the bloodstream through the lymphatic tract and liver sinusoids; 3. Significant increase due to bile ducts in the liver and impaired bile excretion backflow into the bloodstream. One test result alone is not significant, and needs to be combined with clinical symptoms, and related tests for comprehensive analysis.