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A member asked:
How accurate are 1st trimester ultrasounds in estimating gestational age? what about 2nd trimester ultrasounds?
A doctor has provided 1 answer
Accurate!: 1st trimester ultrasounds are very accurate - have correlated with timed ivf pregnancies. We usually consider 1st trimester scans accurate within 5-7days' 2nd trimester scans within 10-14days.
Answered 2/24/2014
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