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A member asked:
Are ultrasounds accurate at dating conception at 12 weeks?
3 doctors weighed in across 2 answers
Not as accurrate: As they are at 4-6 weeks.
Answered 2/14/2013
5.3k views
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Much more than: Later in gestation. First trimester ultrasound is most accurate at estimating gestational age within 5-7 days (depends on the center). It trails off after that. General rule: 2nd trimester scans for dating are +/- 14 days and 3rd trimester is the least accurate (+/-21 days).
Answered 6/22/2017
5.3k views
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