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A member asked:
What's more reliable for edd u/s at 8w1d or lmp? know lmp but they are going by ultrasound now...
A doctor has provided 1 answer
Ultrasound: dates are very good especially if the periods are regular. US is better because of the unreliability of the dates. That said both of the calculations will give you a date which is +/- 2 weeks, so there is very little difference between them and it is only statistical. The baby doesn't care and will come when it wants to.
Answered 8/28/2014
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