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A 35-year-old female asked:

Does 1st trimester ultrasound have margin of error up to 7 days because of the equipment/skill of tech or because fetus can grow at dif rates?

1 doctor answer • 1 doctor weighed in
Dr. Brad Douglas
Dr. Brad Douglasanswered
Obstetrics and Gynecology 26 years experience
Margin of error is: Margin of error is 8% - so it differs the longer you are pregnant...so for example at 10 weeks - you are 70 days pregnant - which 8% means a 5 to 6 day error. If you are 20 weeks - the error is 140 days x 8% which is about 11 days of error .....so you need to do math
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Related questions

A 31-year-old female asked about a 22-year-old female:
Whats the error in a first trimester (9 to 12 weeks ultrasound made by skilled doctor, 3 of up to 7 days? Different awnsers by different doctors here
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A 33-year-old female asked:
If ultrasounds have margin of error, how do u know when you're within the range of when the NT scan should be done?Does fetus have to be certain size?
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A 22-year-old female asked:
What is the error of margin for an ultrasound dating at 11 week 4 day, measuring the fetus crl at 4.8 cm?
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A 24-year-old female asked:
Do all fetuses grow the same in the first trimester? Poss for a fetus to grow small & date multiple weeks behind? Ex actually be 12w, but date 8w?
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A 28-year-old female asked:
LMP was Feb 18, I have shorter cycles of 25/26 days. 3 first trimester ultrasounds gave me a due date of Nov 19-21 putting conception at Feb 27-29. How accurate are these conception dates? Anyway conception occurred before February 20?
1 doctor answer • 1 doctor weighed in
Last updated Oct 21, 2018

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Female health

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