Correlation of Uterine Blood Flow in the First Trimester of Pregnancy and Birth Weight at Term in High Altitude

00:00-00, 2026. OBJECTIVE: To determine the correlation between total uterine artery flow (UtAQ) at the end of the first trimester of pregnancy and birth weight (BW) at term at 3,400 m altitude. METHODS: Prospective study, conducted at 3,400 m altitude in 210 women who underwent routine ultrasound evaluation. The inclusion criteria were singleton pregnancy between 11 and 14 weeks + 1 day, crown-rump length between 45 and 84 mm, born and raised at high altitude (native), and without pathology. The outcome was BW, expressed as a Z score. Variables such as UtAQ, uterine artery (UtA) diameters, age, body mass index, and mean arterial pressure, among others, were evaluated. RESULTS: = 0.006). CONCLUSION: In low-risk singleton pregnancies among native women living at high altitude, a correlation was observed between UtAQ and term BW, with the highest association found between BW and the diameter and UtAQ of the left UtA.