Abstract

To describe the probability of cephalic presentation at each gestational age (GA) from 16+0 to 40+6 weeks using ultrasound in a longitudinal study. The population sample was derived from the Fetal Growth Longitudinal Study (FGLS), a major component of the INTERGROWTH-21st Project, involving healthy women with a singleton pregnancy from urban areas in 8 countries. Women were scanned every 5±1 weeks for fetal presentation, biometry, and placental location. Summary statistics were used to describe demographic and pregnancy-related variables. The probability of cephalic presentation at a given GA was estimated at each completed week. Data from 19,482 ultrasound scans (n = 4,225 women in the FGLS cohort) were available for analysis. The demographics of participants, number of scans per woman, and the probability of cephalic presentation at each GA from 16+0 to 40+6 weeks' gestation were charted. The probability of cephalic presentation increased from 0.41 (95% CI 0.38 to 0.45) at 16 weeks' gestation to 0.97 (0.95 to 0.98) at 36 weeks' gestation and 0.98 (0.96 to 0.99) at 39 weeks' gestation. It is well recognised that the probability of cephalic presentation increases with GA. Here, we present probabilities at each GA, derived from a longitudinal study of 4,225 individual fetuses, which should help clinicians to counsel women.

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