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Doctor insights on: What Is More Accurate Edd You Lmp Or Early Ultrasound

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If LMP and first trim scans all point to same EDD, is the conception date range accurate?

If LMP and first trim scans all point to same EDD, is the conception date range accurate?

Yes: If your dates and ultrasounds are consistent the estimated conception date should be reliable within a few days. Short of tracking ovulation with daily ultrasounds or one of the in vitro methods, that is the best we can do. ...Read more

Dr. Michael Gabor
2,190 doctors shared insights

Sonogram (Definition)

An ultraound, also known as a sonogram, is a painless and relatively inexpensive imaging test that utilizes sound waves instead of ionizing radiation. There are no side effects. Ultrasound can give us two-dimensional, and in some applications three-dimensional, images of structures and organs in virtually any part of the body. In addition to diagnostic uses, such as evaluating abnormalities in the abdomen, pelvis, and breast, ultrasounds are commonly used to guide needle and catheter placement in a variety of surgical ...Read more


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So everyone says early ultrasounds are more accurate then LMP so mine has 4 day difference between edd so should I not go by ultrasound due date ?

So everyone says early ultrasounds are more accurate then LMP so mine has 4 day difference between edd so should I not go by ultrasound due date ?

Within 4 days is : No real difference. There is nothing magical about either date, except for 2 things: 1. If the lmp is different from the early OB us dating by more than 2 weeks, the lmp is probably wrong. 2. What everyone wants to happen is appropriate interval growth - meaning the fetus grows in size to match the time since the last us - that means growth is happening normally. ...Read more

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Is early ultrasound at 8w1d more accurate at predicting conception than LMP? EDD changed going by ultrasound now too...

Possibly: Ultrasound done early is much better than LMP dating for the "Expected date of Delivery." Conception is another issue entirely. Usually conception occurs 2 weeks prior to a missed LMP, but this is ONLY an estimate. Conception dating is not something that is useful in medicine and there is too much variability to do that kind of dating, Unless you are an In Vitro (IVF) pt. Then you know for sure. ...Read more

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So are ultrasounds more accurate in the first trimester at 8w1d? And should I trust if I know my LMP & doctors change EDD going by u/s now??

First trimester u/s: The earlier an ultrasound is done, the more accurate it is. An ultrasound done at 8weeks and 1 day is probably a day or two off. This is the reason for assigning a due date based on your early ultrasound. It is probably only a day or two off. Remember, a due date does not mean that you will deliver right on that day. ...Read more

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My DD is according to 1st trimester is 13 nov latest ultrasound suggests edd 31 October.i don't know my LMP. Kindly suggest does delivery can b early?

My DD is according to 1st trimester is 13 nov latest ultrasound suggests edd 31 October.i don't know my LMP. Kindly suggest does delivery can b early?

Delivery date: Your due date is a marker for when you turn 40 weeks. This is not the same as the day that you will deliver. Normal delivery occurs between 37-42 weeks. A first trimester sonogram is very accurate for due date calculations. The due date is not changed by a 3rd trimester sonogram. ...Read more

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Is u/s dating in first trimester more accurate that going by LMP? EDD changed & going by ultrasound now...

Is u/s dating in first trimester more accurate that going by LMP? EDD changed & going by ultrasound now...

Depends: 1st trimester US is accurate within 5-7 days so if it differs from your LMP due date by more than that then the US is used. Also if you are uncertain about your LMP, most OB's will use that early US. ...Read more

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Had a dating ultrasound i was 14w3d. Couldnt use LMP i was on depo,I wasnt having periods. Can edd be off by 2w3d at 14 week ultrasound.How accurate?

Had a dating ultrasound i was 14w3d. Couldnt use LMP i was on depo,I wasnt having periods. Can edd be off by 2w3d at 14 week ultrasound.How accurate?

Unlikely: 14 week ultrasound is on the cusp between first and 2nd trimester. First trimester ultrasound usually accurate to 3-5 days. Second trimester accurate to 1-2 weeks. So at 14 weeks I would doubt the dates would be 2w3d off. This would be more likely in the third trimester. ...Read more

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If my early 6 week ultrasound puts my edd four days after my edd from lmp, which one should I go by, my ob/gyn says ultrasound what do you think?

If my early 6 week ultrasound puts my edd four days after my edd from lmp, which one should I go by, my ob/gyn says ultrasound what do you think?

If: Your lmp is certain then by convention you go with the lmp if it's within 1 week of the ultrasound. If they differ more than 1 week, or if the lmp is not known, then go with ultrasound. That's the convention. ...Read more

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Dr. Chevies Newman
1,113 doctors shared insights

Premature (Definition)

Very premature is a condition in which a baby is delivered between 28 and 31 weeks' gestation. Depending on how premature, how sick, and how lucky or unlucky a baby is, he can get brain problems, cerebral palsy, blindness, deafness, developmental problems, learning disabilities, severe lung diseases, infection and loss of some intestines, etc... Babies who are only moderately premature usually ...Read more