Fetal Age

5 Replies
butterflye878 - March 9

I was wandering if the gestational age measured by an ultrasound has anything to do with your LMP or are they completely seperate dating tools?

 

sososleepy - March 11

Hey b___terfly. I found a great short story on the web that gives you a fun example of how pg's are dated. standard beginning .obgyn.net/women/women.asp?page=/women/articles/lmp

 

sososleepy - March 11

I'm back.. I posted that before I finished reading it. It has some excellent info after the story and graphs and pix to make it all very clear. To answer your question; they're different. LMP to birth is roughly two weeks earlier than conception to birth, obviously, and the terminology gets confusing thereafter... You're due roughly 40 weeks from LMP, roughly 38 weeks from conception... look up gestational age and ultrasound for some more confusing reading...

 

DownbutnotOUT - March 11

I had irregular periods and i could have sworn I was 3-4 months along with my 2nd but the u/s showed a fetus of around 6 weeks so they obviously went by the u/s date. I believe if you know your LMP they use it as a base but when you have your u/s and it shows a difference of a week or two they still use LMP but anymore they change your due date. Sometimes LMP and u/s are used to verify each other and other times they contradict and when that happens the u/s date always wins for its more accurate.

 

MNMOM - March 11

they should measure close to the same, that is why they have more than one way to predict gestational age!

 

Grandpa Viv - March 12

Careful of the terminology. Gestational age refers to weeks since conception, weeks of pregnancy refers to weeks since LMP, usually two weeks earlier. When the ultrasound results come back, cross check "is that actual gestational age - do I add 38 weeks for the due date, or 40?"

 

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