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A member asked:
What is the due date accuracy w/ 1st trimester ultrasound?
A doctor has provided 1 answer
It depends: It depends on what was measured and when. Very early, the sac diameter is accurate to ±5 to 7 days. Later, a measurement called the 'Crown-Rump-Length' at 7 to 10 weeks of gestation is the accurate to ±3 days. After 10 weeks, the accuracy of the CRL falls slightly with a margin of error of ±5 days at 10 to 14 weeks.
Answered 5/16/2014
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