What does it mean if the s/d of umbilical artery blood in week 36 of pregnancy is 1.9?

Patient's question:

No

Doctor's answer:

Generally, at your pregnancy stage, S/D should not exceed 3. It is recommended to pay attention to fetal movement at any time, and seek medical attention promptly if there are abnormal fetal movements. S/D values tend to be abnormally elevated in various obstetric complications, which can help detect fetal intracranial hypoxia early.