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The earlier and ultrsound is performed the more accurate it is. Usually around 7 weeks. But any time in the first 20 weeks is accurate to within 5 days. After this babies weights start to vary too much the estimate to be as accurate.

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βˆ™ 2006-09-07 06:55:17
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Q: When is the best age to have an ultrasound to find edd when lmp is unknown?
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