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A member asked:
Are the measurements that precise on ultrasounds that it can show the difference between a 12wk fetus and a fetus that is 12wks and 4 days?
3 doctors weighed in across 2 answers
No.: At 12 weeks, the estimated accuracy of ultrasound measurements (crown-rump length or crl) is +/- 7 days. Take Folic Acid 1-5 mg daily and best of luck!
Answered 10/24/2017
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NO: There are minor variations in how the measurements are made and differences in the size of different fetuses. These variations can easily account for a four day discrepancy.
Answered 12/18/2012
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