Hyperphenylalaninemia, also known as phenylketonuria, is an autosomal recessive genetic disorder. The country is now taking hyperphenylalaninemia very seriously, and as long as a child is born in a regular medical institution, blood will be collected within three days, from the bottom of the foot, for screening for hyperphenylalaninemia. This is because if detected early and treatment is started early, the prognosis can be improved to a great extent. If the child is found to have hyperphenylalaninemia, he or she must be given a special formula orally as soon as possible, which means that the formula does not contain phenylalanine, and this measure must be taken. In addition, you must go to a professional medical institution, listen to the advice of professional experts, and start treatment early. If this disease is treated early, the healing process is still good and the prognosis can be improved to a great extent. Of course high phenylketonuria will show clinical symptoms once it develops. The clinical symptoms are mainly mental retardation, loss of pigmentation, the child shows white hair, delayed parenting and other clinical manifestations. There is also this kind of children, urine has a special rat urine odor, the smell is very unpleasant, which is also the more prominent clinical characteristics. The above content is for reference only, please refer to the doctor’s interview for specific medication and treatment guidance.