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Doctor insights on: Ultrasound For Due Date

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Embreo transfer or ultrasound is due date more accurate?

Embreo transfer or ultrasound is due date more accurate?

Embryo transfer: Embryo transfer would be the ultimate gold standard for gestation age.The number of days since conception of the transferred embryo (3-5 days) would be known so the precise time of conception would be available so the estimated due date could be more precisely estimated. ...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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My doctor said b/c my baby was small at my 21 week ultrasound, my due date changed from may 31 to june 16. How accurate are these estimates?

My doctor said b/c my baby was small at my 21 week ultrasound, my due date changed from may 31 to june 16. How accurate are these estimates?

You said it: estimate. These values are based on measurements of the baby and have a variation depending on how far along the pregnancy you are. Towards the end there could be a three week range of delivery dates. It is always best to talk openly with your doctor ...Read more

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What do you suggest if my doctor said b/c my baby was small at my 21 week ultrasound, my due date changed from may 31 to june 16. are they right?

What do you suggest if my doctor said b/c my baby was small at my 21 week ultrasound, my due date changed from may 31 to june 16. are they right?

Ultrasound dating: First trimester ultrasound is accurate within 5-7 days. Lmp dating also assumes a 28 day cycle. Due date is based on lmp unless us off by more than 1 week 1st trimester or 2 weeks in 2nd. And it's only an estimate; the baby will decide when to come regardless of what you or your doctor think :). ...Read more

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I don't remember my lmp. According to ultrasound my due date is oct 10th...Around what time did I concieve?

I don't remember my lmp. According to ultrasound my due date is oct 10th...Around what time did I concieve?

When was scan done?: Accuracy of ultrasound varies from 3 days to 2-3 weeks depending on when it was done. Plus the date of sex can be around not always on the suspected date of conception. The date of pregnancy test and size of the uterus during first pelvic can also help determine the approximate date. So, to avoid misunderstanding, it is best to ask the OB performing the first pelvic and ultrasound if mid-january. ...Read more

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Nursing mum, my LMP was on june 4th.July 4th I got psv pgn test but it was very faint line.Ultrasound showed due date on april 1st!4 weeks behind?Why?

Nursing mum, my LMP was on june 4th.July 4th I got psv pgn test but it was very faint line.Ultrasound showed due date on april 1st!4 weeks behind?Why?

Delayed ovulation: While nursing, menstrual cycles and ovulation often become irregular. This makes it diifficult to date a pregnancy by your lmp. Ovulation occurred 4 weeks after expaected and the menses may not have been a normal period. ...Read more

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Should i refuse to let them stop labor? Im pregnant with my first child and my due date is may 27th according to doctor. According to all my ultrasounds my due date is may 18th, also i know the exact day i got pregnant and it matches the may 18th due date

Should i refuse to let them stop labor? Im pregnant with my first child and my due date is may 27th according to doctor. According to all my ultrasounds my due date is may 18th, also i know the exact day i got pregnant and it matches the may 18th due date

Wow. : Wow. You are asking doctors who have never met or examined you on an internet site if you should refuse recommended medical care. As you are already aware, there is not certainty if the baby's lungs have developed enough at this point. If you adamantly disagree with your doctor's medical recommendations, then you could request that the doctor help to arrange for a second opinion by another obstetrician. However, as a woman who has had babies, i can tell you that there is often a struggle between the woman wanting to be delivered earlier and the doctor who is wants to wait closer to term to allow for full development of the baby. ...Read more

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If ultrasound shows due date of october 31 what was the earliest and lastest date I could have gotten pregnant. Ultrasound done in July 2014?

Due date: This depends, was the Ultrasound done during the first trimester? Do you know you last menstrual period (LMP) - because if you are certain about this and it coincides with your dating by ultrasound you can be be assured the due date is pretty accurate. A 1st trimester U/S used for giving a due date is pretty accurate by itself as well. Answer: February 7 plus or minus a few days was conception. ...Read more

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How accurate are ultrasounds in determining due date?

How accurate are ultrasounds in determining due date?

Depends on dates: The ultrasound (us) is the most accurate way we have of deciding how pregnant you are. There is a variation in us accuracy due to how we measure and who is measuring, but the accuracy is about 3-4 days before or after the measured size until about 10 weeks, plus or minus a week to about 14-15 weeks, then gradually changing up to a 3 week range in the last 2 months of pregnancy. ...Read more

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How accurate is an ultrasound due date estimate?

How accurate is an ultrasound due date estimate?

Best on earlier u/s: Ultrasounds use composite data obtained during the exam to determine an EDD (estimated date of delivery). This date will also have a +/- number of days giving an accuracy range. First trimester ultrasounds are accurate to within about a week, second trimesters estimates are accurate within about 2 weeks, and third trimester scans about 3 weeks. ...Read more