Get Virtual Care
For Businesses
About Us
A member asked:
What if you know your lmp (which is regular 28 day cycle) but doctors change edd going by first ultrasound. why, did i ovulate later or what??
3 doctors weighed in across 2 answers
"Guesstimation": Your EDD is a "estimated date of delivery" and is based upon several factors including LMP, first ultrasound, etc. Yes, it is a "guesstimation" which is only accurate plus or minus 2 weeks. Ovulation dates have nothing to do within it.
Answered 12/17/2020
3.8k views
Ultrasound Due date: The EDD is just that. Actually ony about 5% deliver on the EDD. If the ultrasound is done and the date is way off, the EDD is changed from the LMP EDD. Because sometimes a woman doesn't ovulate regularly, it is possible the pregnancy doesn't start for several months after the LMP, so the Ultrasound is used if the date seems way off. This test is more reliable in early pregnancy.
Answered 8/30/2014
3.8k views
Related Questions
A member asked:
If my LMP was 9th sept but i didn't ovulate til 4 weeks later, will dr still use my LMP or my ultrasound due date?
A doctor has provided 1 answer
A member asked:
If you ovulate later than the normal 14 days after lmp, would the dating ultrasound this and would it affect your due date?
A doctor has provided 1 answer
A member asked:
My LMP was unknown so on 7/20 doctors said i was 8w3d by ultrasound & told me my due date is 2/26/13 & that i conceived on 5/22 is this correct?
3 doctors weighed in across 2 answers
A member asked:
The doctors determined my due date from an estimated lmp, it was nov4 . Sept 16, i got an ultrasound that read oct25 which date is accurate?
A doctor has provided 1 answer
A member asked:
Is u/s dating in first trimester more accurate that going by LMP? EDD changed & going by ultrasound now...
A doctor has provided 1 answer
People also searched for:
What makes doctors decide to go by ultrasound for EDD instead if LMP? EDD was changed from January 2 (LMP) to January 12 (u/s)
Lmp may 5th 2014 dtd w guy a may 11th guy b 15th doc I ovulated anywhere from 15th thru 20th..fIrst sono was july 1st I measured 8wk n3day Edd 2/8/15?
If a sonogram due date matches LMP due date, does that mean ovulation was right on time of regular cycle, and not earlier?
Why do doctors choose to go by ultrasound for EDD instead of LMP, even if LMP is known?
When does it mean when a doctor considers the LMP due date and conception if the ultrasound is in a 7-10 day agreement with the lmp? Need an example
Didn't find what you're looking for?
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your questionMore of what we treat
Download HealthTap
Video visit and message your doctor
