Conclusion: Ultrasound was more accurate than LMP in dating, and when it was used the number of postterm pregnancies decreased. Crown-rump length of 15-60 mm was superior to BPD, but then BPD (at least 21 mm) was more precise. Combining more than one ultrasonic measurements did not improve dating accuracy.Conclusion: Ultrasound was more accurate than LMP in dating, and when it was used the number of postterm

Which is more accurate EDD vs ultrasound?

Earlier ultrasounds are more accurate in terms of predicting the due date, so thats why doctors will usually use the dates and measurements from the first ultrasound of the pregnancy as a reference. As pregnancy progresses, the accuracy of an ultrasound for predicting due dates decreases.

Which EDD date is more accurate?

The earlier the ultrasound is done, the more accurate it is at estimating the babys due date. Ultrasounds performed during the first 12 weeks of pregnancy are generally within 3 - 5 days of accuracy. The most accurate time is between 8 and 11 weeks gestation.