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A member asked:

Iam 27weeks pregnant&got 3 edd s asper lmp 2nd dec, as per 9th weekscan 5th dec & as per 13th week scan 29th nov &anomaly scan 8th dec.which is right?

A doctor has provided 1 answer

Ultrasound dating: First trimester ultrasound is accurate within 5-7 days. 2nd trimester ultrasound has accuracy of +/_ 2 weeks. There is no test that can date conception more accurately than a 1 week window. Assume the first week of december. It's all an estimate anyway, the baby decides when to come, and usually not on due date!

Answered 12/10/2013

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Related Questions

A member asked:

My first scan my due date i got 8th feb 2014 and it hasn't changed since. My LMP is 6th may 2013. Can my due date be off by a week or few days?

A doctor has provided 1 answer

A member asked:

If lmp and 3 separate scans all give a edd of 4th October what are the possible dates of conception?

A doctor has provided 1 answer

A member asked:

1st of August 2014 my dating scan dated me 12 weeks and 5 days with a due date of 8th February as I dont know my LMP what dates did I get pregnant?

A doctor has provided 1 answer

A member asked:

My cycles are very irregular. 29th jan 2012 scan said 11w1..Crl 44mm..Edd 18th august. I don't remeber my lmp. Could I have concieved 5th december 2012?

A doctor has provided 1 answer

A member asked:

Lmp 21/08/12 due date 29/05/13 went for 12 week scan to find i was only 9 weeks 3 days and given due date of 18/06/13 when could i of concieved?

A doctor has provided 1 answer

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