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A member asked:
When are prenatal ultrasounds most accurate for estimating conception? 6 weeks or 10 weeks or 19 weeks?
A doctor has provided 1 answer
I vote for: 10 weeks: Usually, prenatal ultrasound scans done while 8-11 weeks pregnant give accurate dating estimates. All dates are estimates, but that doesn't matter much in most cases (an estimate is close enough). If one's cycles are long (more than 31 days) or short (less than 25 days), be sure that is taken into account when making the estimates.
Answered 8/18/2015
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Related Questions
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How accurate are 8 week ultrasounds in determining the time of conception?
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When it is said that early (8 wk) ultrasounds are accurate +/- 2 days, what exactly does that mean? It is 1 to 2 days accurate of the conception day?
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Why does my ultrasound match my (estimated) date of conception rather than my gestational age?
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How accurate is an early ultrasound? On 6/15/18 baby measured 5w6d. Between what dates could conception of happened? LMP 5/5.
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