A member asked:

How accurate are 1st trimester ultrasounds in estimating gestational age? what about 2nd trimester ultrasounds?

A doctor has provided 1 answer
Dr. Meena Khandelwal answered

Specializes in Obstetrics and Gynecology

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

5.5k views

Thank

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What is the due date accuracy w/ 1st trimester ultrasound?

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