Loss of diastolic blood flow in the umbilical artery but normal fetal heartbeat is usually abnormal, and it is recommended to communicate with your doctor for other tests to clarify the cause. Loss of diastolic blood flow in the umbilical artery usually indicates that there is an abnormality in the process of blood supply and return from the umbilical cord to the fetus. This may also lead to insufficient blood supply to the fetus. If the umbilical artery diastolic blood flow disappears but the fetal heart is normal, then it may be a detection error, which may be related to improper operation. It is also possible that the fetal abnormality is not detected, usually the umbilical artery diastolic blood flow disappears, usually the fetal heart will appear too fast or too slow, which is related to fetal hypoxia and ischemia. After the umbilical artery diastolic blood flow disappears but the fetal heart is normal, it is recommended that the ultrasound can be repeated to observe the condition of the fetus. If the loss of diastolic flow in the umbilical artery persists, a cesarean section may be necessary to deliver the fetus. If the diastolic flow of the umbilical artery disappears during pregnancy, it is recommended to lie on the left side of the bed and inhale oxygen to relieve the hypoxia of the fetus, and choose the appropriate treatment under the guidance of the doctor in order to avoid any accidents of the fetus.