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Re: 10 week ultrasoundFrom: Richard Chudacoff, MD (anonymous@obgyn.net)Sat, 20 Oct 2001 20:56:52 -0500 (CDT)
At Sat, 20 Oct 2001, Lolly wrote: > >Hello, I had an ultrasound done at 10W3days or 30mm CRL. The ultrasound >pictures states a margin of error of + or - 8 days. To get my possible >date of conception, then do I subtract 14 days because ultrasound dates >2 weeks older and then + or - 8 days to get possible conception date. Is >+\- 8 days an accurate margin of error at this stage? Thanks. Date of conception is about 2 weeks after your last menstural period, so you are correct. Your ultrasound at 10 weeks is fairly accurate, and if it is within 7 days of your LMP one would not change your due date. Your conception date will be better based on your LMP, if you have regular cycles, and by ultrasound if you do not.
-- Richard Chudacoff, MD Chudacoff Obstetrics & Gynecology, PLLC Sugar Land, TX
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