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A member asked:
What is the accuracy of an us performed at 14 wks? still considered 1st tri? i hear everything from a few days to weeks. still measure using crl?
A doctor has provided 1 answer
About +/- 1 week: 14 weeks would be very early 2nd trimester. Crl maxs out at 14 weeks at 7.9cm. We also will measure bpd, femur length, head circumference, and abdominal circumference by 14 weeks.Accuracy should be about +/- 1 week.
Answered 9/11/2013
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