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Gestational age vs LMP date?

Forum: May 2014 Playroom


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October 6th, 2013, 04:23 PM
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-Post deleted as I am permanently leaving this forum do to bullying and extremely rude people. I do not recommend this forum to anyone unless you want to be bullied. The mods do absolutely nothing to stop it. If you are a bully you will fit in great.

Last edited by bugz; August 30th, 2014 at 06:21 PM.
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October 6th, 2013, 04:37 PM
bella88's Avatar Mega Super Mommy
Join Date: Jun 2008
Location: Australia
Posts: 4,058
LMP is based on your period and assumes you O on CD14 when it calculates your due date. Usually pretty inaccurate. I think mine based on LMP would he off by a day but I O'd on CD15 so not far off "normal". I could be wrong but I think gestational age is based on size of the baby? Will usually be more accurate.

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October 6th, 2013, 05:49 PM
*CAMM*'s Avatar Platinum Supermommy
Join Date: Jan 2007
Location: somewhere over the rainbow
Posts: 8,635
Thats how I understand it as well. They can be different because the LMP assumes all women have a 28 day cycle and ovulate on cycle day 14. Thats why a lot of doctors do an early ultrasound to help dating because it is much more accurate.

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October 6th, 2013, 06:01 PM
emilyeeb's Avatar Veteran
Join Date: Sep 2013
Location: GA, TN
Posts: 275
Yes, what they said. lol I have 35 day cycles so I always calculate mine based on when I suspect I ovulated. I haven't had an ultrasound yet so my dates could certainly change. Heck, I could even be due in June.

Thank you for my siggy Jaidynsmum!

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October 6th, 2013, 06:48 PM
Masesmama's Avatar Veteran
Join Date: Aug 2013
Location: Arizona, USA
Posts: 439
Yeah it's kinda a toss up. If you know for sure when you ovulated because you were charting, it is possible that an ultrasound could be off because they say those are plus or minus 7 days. My ovulation date was August 22nd based on positive opk and temperature but I am measuring 6 days ahead of that. So I'm sort of going with both dates because neither is 100% and 40 weeks is just an estimate anyway.
Mommy to Mason, Jan. 2010

Expecting Baby Boy #2!

Due May 12, 2014!

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