What is the most accurate due date predictor?
The most accurate method for predicting an estimated due date during pregnancy is an early first-trimester ultrasound scan performed between the eighth and fourteenth weeks of gestation. During this developmental window, fetal growth rates are remarkably uniform across all pregnancies, allowing crown-rump length measurements to establish gestational age with a very narrow margin of error. While Naegele's rule—which calculates the due date based on the first day of the last menstrual period—is useful for initial estimates, it is frequently less accurate than early ultrasound dating due to variations in individual ovulation cycles.
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