Low Hepatitis B Alkaline Phosphatase may be due to malnutrition, anemia and other conditions. Hepatitis B alkaline phosphatase is an enzyme that is synthesized and secreted in the body’s liver and then excreted out of the bile through the liver. Reference normal range values for Hepatitis B Alkaline Phosphatase: For females, the normal range for ages 1 to 12 years is less than 500 U/L; for ages older than 15 years, the normal range is 40 to 150 U/L. For males, the normal range for 1 to 12 years of age is less than 500 U/L; for 12 to 15 years of age, the normal range is less than 750 U/L; and for those older than 15 years of age, the normal range is 40 to 150 U/L. If the normal range of values is lower than the normal range of hepatitis B alkaline phosphatase according to the corresponding age group and gender, it means that the alkaline phosphatase is low. Low Hepatitis B alkaline phosphatase is most often considered to be a result of impaired liver function caused by malnutrition, anemia, and other factors that alter hepatic synthesis and secretion. It is necessary to increase nutrition to correct anemia and malnutrition, and if it cannot be improved by diet, it is necessary to use multivitamin or iron supplements to correct anemia under the guidance of doctor. Hepatitis B alkaline phosphatase is commonly caused by malnutrition, anemia and other diseases, should go to the hospital in a timely manner to follow the doctor’s instructions for further examination and treatment of the cause.