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A member asked:
Some say that fetal ultrasound measurements @ 12 weeks can be off by 2weeks. some say a few days (+\-5 days). which is it? do radiologists know best?
2 doctors weighed in across 2 answers
See below : The younger the fetus, the more accurate the measurement. Radiologists are the accepted specialists for ultrasound.
Answered 4/7/2013
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Accuracy: At 12 weeks is +/-3-5 days if crown rump measurement is used.
Answered 1/30/2014
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