The placenta position is normal when it is >7cm from the cervical opening, and changes in the placenta position can be observed dynamically under the guidance of the doctor.
For pregnant women with high-risk factors such as history of multiple miscarriages, history of cesarean section, history of puerperal infections and history of uterine operations, ultrasound examination should be conducted under the guidance of the doctor during pregnancy to observe the position of the placenta. It is normal when the lower edge of the placenta is >7cm from the cervical os; however, when ultrasound in the mid-pregnancy suggests that the placenta has reached or covered the cervical os, it may be rechecked according to the doctor’s instructions.
When the mid-pregnancy ultrasound suggests that the placenta is in a low position, it is necessary to rest appropriately and prohibit coitus. With the increase of pregnancy weeks and the formation of the lower segment of the uterus, it is possible that the placenta originally attached to the lower segment of the uterus may be restored to its normal position.
When the ultrasound review of the placenta is normal, normal labor and delivery examination can be carried out. However, when the position of the placenta is still low in the 28-week review, placenta praevia or placenta praevia can be diagnosed, and the management of pregnancy should be strengthened.