The report is usually issued half a month to a month after the heel blood is collected. Heel blood testing is required for every child after birth. The heel blood test is mainly used for two diseases, hypothyroidism and phenylketonuria, but can also be used for other metabolic diseases, and the specific test items may vary slightly from region to region. Children can be tested at the pediatrics department of their local hospital or at a maternal and child health center. Through early detection and early detection, abnormalities can be treated in a timely manner. Hypothyroidism and phenylketonuria both cause mental retardation, which can have a significant impact on a child’s growth and development. If the test is positive, the child should have timely intervention and active treatment under the guidance of the doctor to help the child develop normally. Parents are advised to pay attention to the heel blood test, communicate with the doctor if there is any problem, and take active treatment measures.