The normal standard of the middle cerebral artery SD varies at each stage, and regular prenatal examinations are required to ensure the normal development and growth of the fetus in the uterus, as well as to take good care of oneself.

Before 16 weeks of pregnancy, the normal range of SD value is generally between 3.5 and 5.5. After 16 weeks, it is about 2 to 5. The SD of the middle cerebral artery in the brain refers to the condition where the fetal brain can develop normally within the normal range. If abnormal symptoms occur, they may affect the normal development of the fetal brain. It is necessary to take oxygen therapy to help improve the symptoms in a timely manner, and to regularly visit the hospital for follow-up examinations to observe the development of the fetal brain. In addition, it is necessary to consume an adequate amount of protein during pregnancy, such as milk and eggs, as the fetus requires a large amount of protein. Only by consuming enough protein can the normal development and growth of the brain be promoted.

The supplier of the middle cerebral artery in the fetal brain, about 80% of the blood in the fetal brain. If the fetal brain’s own protective effect is activated under conditions of hypoxia, it will cause a redistribution of the fetal blood supply, prioritizing the brain first, and the arteries in the brain will undergo a series of changes. Generally, it is more meaningful to monitor the middle cerebral artery of the fetal brain after 20 weeks of pregnancy.