Umbilical artery (S/d) normal value at 22 weeks of pregnancy

Patient's question:

No

Doctor's answer:

The S/D ratio of fetal umbilical artery blood flow refers to the ratio of the systolic pressure to the diastolic pressure in the fetal umbilical artery. The normal value is related to the gestational week, with the S/D value in the late pregnancy usually being less than or equal to 3.0 considered normal.