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A member asked:
Can a 5 week ultrasound be off by a week or more like a couple days?
3 doctors weighed in across 3 answers
Possible few days: Radiologist , interprets pretty accurately , may be off by few days not few wks, as the embryo will follow the clock like pattern , end of 4 , beginning of 5 wk you see gestational sac and fetal pole, speak to your doctor who has more information, good luck.
Answered 7/30/2013
5k views
Ultrasound dating: First trimester ultrasound is accurate within 5-7 days. There is no test that can date conception more accurately than a 1 week window.
Answered 5/6/2015
5k views
Ultrasound +/- 8%: Properly performed and interpreted ultrasound examinations have a variability of 8% plus or minus the measured dating. Given the dates in the question and assuming a high-quality ultrasound, i would suspect that last menses dating is inaccurate. Ultrasound dating at 5 weeks 0 days should have a 95% confidence range of 4 weeks 4 days to 5 weeks 3 days which is +/- 8%.
Answered 12/10/2013
5k views
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