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A member asked:
Do all fetuses in 1st trimester measure the same or can there be wide variation? a12 wk fetus couldn't measure 8-9 wks;too wide a difference in mm?
A doctor has provided 1 answer
Early sono: Early sonograms are very accurate. The margin of error at 12 weeks would be about 5 days. A 12 week fetus would not measure 8 weeks.
Answered 2/26/2013
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