Alkaline phosphatase is present in all tissues of the body and is excreted from the biliary system via the blood to the liver. It is found in high amounts in the bones, liver, kidneys, and also in the liver organs, with a normal reference value of 45-125 U/L. Alkaline phosphatase changes should be considered in diseases of the liver, bone disease, and brain. Low alkaline phosphatase may also occur in pregnant women. Low alkaline phosphatase in pregnant women is most often seen in cases of malnutrition and anemia, which usually have no symptoms and have basically no effect on the baby. However, the nutritional adequacy of pregnant women is closely related to miscarriage, premature birth and premature rupture of membranes, and severe deficiencies in protein, vitamins and trace elements can even cause miscarriage. In order to avoid low alkaline phosphatase in pregnant women due to lack of nutrition, nutritional supplements can be provided to increase the intake of trace elements to promote better growth of the fetus in the body. Low alkaline phosphatase in pregnant women may also be due to disease. For example, a pregnant woman with hepatitis B may also have a low alkaline phosphatase index during pregnancy. If the pregnant woman has poor liver function in the first 3 months of pregnancy, such as loss of appetite, nausea, vomiting, abdominal pain and other serious symptoms, further treatment must be carried out under the guidance of a doctor.