What is the normal value of uterine artery blood flow?

The normal value of uterine artery blood flow is the value of uterine blood supply, which is used to monitor pregnancy status, fetal development, etc.

Normal values ​​of uterine artery blood flow: non-pregnant: RI (blood flow resistance index) <0.85, PI (pulsatility index) <3, S/D (maximum systolic blood flow velocity/end diastolic blood flow velocity) <6; early pregnancy: RI <0.75, PI <2.25, S/D <6; mid-pregnancy: RI <0.73, PI <1.5, S/D <3.6; late pregnancy: RI <0.58; PI <0.82; S/D <2.6.

There are several things to note when testing uterine artery blood flow and judging abnormal values:

1. Checking the uterine artery blood flow requires fasting, which is similar to checking blood sugar and liver function. You need to fast for 6 to 8 hours before the test, but you can drink a small amount of water. You need to hold your urine before the test, as being in anuric state will affect the final result. However, do not hold your urine for too long, just feel the urge to urinate.

2. The uterine artery blood flow values ​​during pregnancy are much lower than those during the non-pregnancy period. The lower the RI and PI values, the better the uterine blood perfusion and the higher the embryo implantation rate. Otherwise, it is easy to lead to embryo maldevelopment, recurrent miscarriage, etc.

3. The uterine artery blood flow value will be affected by the disease. If the value is abnormal without symptoms, the uterus and ovaries should be checked specifically. It is likely that uterine fibroids or premature ovarian failure have caused the uterine artery blood flow value to increase or decrease.