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A member asked:
How accurate are doctors in knowing the date of conception once a woman has had an ultrasound?
4 doctors weighed in across 2 answers
Within 3 days : If the ultrasound is done in the 1st trimester it is very accurate in dating the pregnancy usually within 3 days of accuracy. The later in pregnancy the ultrasound is done, the larger the windows of accuracy of the ultrasound.
Answered 7/28/2016
5.7k views
Depends.: +/-3-5 days by ultrasound before 10 weeks. +/-5-7 days by ultrasound between 10-14 weeks. +/-7-10 days by ultrasound between 14-20 weeks. +/-10-14 days by ultrasound between 20-24 weeks. +/-14-21 days after 25 weeks.
Answered 2/1/2015
5.7k views
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When does it mean when a doctor considers the LMP due date and conception if the ultrasound is in a 7-10 day agreement with the lmp? Need an example
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Which is more accurate at determining the date of conception? A 5 or 8 week ultrasound?
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