What is the normal range for uterine artery indices at 12 weeks of gestation?

At 12 weeks of gestation, the normal uterine artery indices are generally a resistance index less than 0.75 and a pulsatility index less than 2.25. Detailed information is as follows:

Under normal circumstances, uterine artery indices in pregnant women typically change with gestational age and usually range between 0.85 and 2.62. At 12 weeks of pregnancy, the normal resistance index of the uterine arteries should be less than 0.75, the pulsatility index less than 2.25, and the arterial-venous blood flow ratio less than 6. The sum of measurements from both sides should yield a combined resistance index less than 1.5, a pulsatility index less than 4.5, and an arterial-venous blood flow ratio less than 12. Abnormal uterine artery indices during pregnancy may lead to impaired umbilical blood flow, potentially causing fetal hypoxia and ischemia.

Pregnant women should undergo regular prenatal checkups and maintain regular作息 (daily routines), adequate sleep, a positive mood, and balanced nutrition, all of which contribute to healthy fetal development.