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A member asked:
I am 5w4d. ultrasound showed gs & ys dating 4w5d. gs measured 8mm. using the formula 30+8 that would put me at 5w3d. i'm really confused with the dating of the ultrasound vs the formula dating.
5 doctors weighed in across 2 answers
LMP: Remember, dating can never be exact - it's really just to get the best estimate for both tests throughout pregnancy and estimated date of deliver. If the ultrasound and the dating by your last menstrual period are pretty close, usually your dating will go by your last menstrual period - unless you were sure of it, or it was irregular, of you were taking birth control prior to pregnancy. Congrats!
Answered 4/5/2016
4.2k views
They actually agree: Hello although early ultrasounds are the most accurate, they are just a photograph, and can easily measure off by a week. If you are certain of the first day of your cycle, and especially of conceptinn date, that is more accurate even than an early ultrasound. It is considered 'agreement' if the sono is less than a week off from the menstrual dating.
Answered 4/20/2014
4.2k views
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