Reference Ranges for Doppler Indices of Uterine Arteries
in Pregnant Women During 22-28 Weeks' Gestation : A
Study at King Chulalongkorn Memorial Hospital
THEW IN DEJTHEVAPORN, M.D.*, VORAPONG PHUPONG, M.D.*,
BOONCHAI UERPA IROJKIT, M.D.*, TEERA WACHARAPRECHANONT, M.D.*,
YUEN TANNIRANDORN, M.D.*, DHIRAPHONGS CHAROENVIDHYA, M.D.*
Affiliation : * Department of Obstetrics and Gynecology, Faculty of Medicine, Chulalongkorn University, Bangkok 10330, Thailand.
AbstractColor pulsed Doppler ultrasound was used to examine the uterine arteries of a total of 265
normal pregnant women during 22-28 weeks' gestation at the Division of Maternal-Fetal Medicine,
King Chulalongkorn Memorial Hospital. Reference ranges for pulsatility index (PI) were determined
and throughout this gestational range, the mean values were nearly constant and lower than 0.9 and
the upper limit of 95 per cent confidence interval (CI) for the PI values were lower than 1.0. In
conclusion, the authors have established the reference ranges for PI of uterine arteries in the late
second to early third trimester of pregnancy in Thai pregnant women. This could be beneficial for
the baseline data in the evaluation of pregnant women complicated with preeclampsia and fetal
growth restriction.
Keywords : Reference Ranges, Uterine Artery, Doppler Indices, Pregnancy
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