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Doctor insights on: What Is The Result Of Ultrasound For Due Date In Pregnancy

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What is the more accurate due date ur last period or the mesurments of the baby?

What is the more accurate due date ur last period or the mesurments of the baby?

Earliest: Due date is best determined by earliest data.For example early ultrasound (less than 12 weeks) consistent with last perod is very realiable at determining due date. I have aleays understood that as time goes on ultrasound measurements less realiable at detetmining due date. ...Read more

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Dr. Michael Gabor
2,244 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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Hi is the any mistake in ultrasound result for 11 days in the 6th week of pregnancy?

Hi is the any mistake in ultrasound result for 11 days in the 6th week of pregnancy?

Pregnancy dating: I assume by you mean a discrepancy in size? A first trimester ultrasound is considered "consistent" with dating by lmp if measurement is within 7 days of the gestational age by lmp. A 1st trimester ultrasound is a more accurate way to date a pregnancy in most cases because due date based on lmp assumes that you had a 28 day cycle and ovulated on day 14. Many woman do not have a 28 day cycle. ...Read more

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How important is the date of the last menstrual period in relation to the actual ultrasound dating?

How important is the date of the last menstrual period in relation to the actual ultrasound dating?

Depends: For an early sono the lmp is less significant since early on, the sono dates are felt to be more accurate. If a patient shows up in the third trimester for her first sono the lmp dates are more important since they are usually a better guess of the actual fetal age. The sono is then used to try to estimate fetal size and growth on subsequent scans. ...Read more

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What is the accuracy of an abdominal ultrasound in the first trimester? Possible to be off 4 weeks?

What is the accuracy of an abdominal ultrasound in the first trimester? Possible to be off 4 weeks?

Ultrasounds: Nope. It is very unlikely that an early ultrasound is inaccurate by much, especially four weeks. The early ultrasounds are much more accurate in general. ...Read more

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In the absence of knowing my period i so far had two sonograms which matched how reliable are the sono results in place of period?

In the absence of knowing my period i so far had two sonograms which matched how reliable are the sono results in place of period?

Depends how early: If you had an ultrasound in the first trimester, the dating would be very accurate (within a few days). This is obviously not exact, but a very good estimate. ...Read more

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Will an ultrasound know the difference between implantation bleeding and a period or would that cause my due date and date of conception to be wrong?

Will an ultrasound know the difference between implantation bleeding and a period or would that cause my due date and date of conception to be wrong?

Confuses the dates: An ultrasound will measure the size of the pregnancy which will tell you how to interpret the bleeding. If it was "implantation" bleeding the pregnancy will be farther along than if it was a period. You will adjust the due date and date of conception accordingly. ...Read more

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What are my most probable dates of conception with a LMP of 10/15/12 and a due date of 7/22/13?

What are my most probable dates of conception with a LMP of 10/15/12 and a due date of 7/22/13?

Conception: The most likely dates of conception are either october 28, 29th, or 30th. ...Read more

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What is my conception date if I'm due July 23rd and what is my window for the dates of possible intercourse that lead to pregnancy?

What is my conception date if I'm due July 23rd and what is my window for the dates of possible intercourse that lead to pregnancy?

Conception: A due date of 7/23 would be the same as having a last menstrual period of 10/16. Best conception date assuming 28 day cycles would be 10/30 with possible dates around 3 days on either side of that. However, due dates are approximations, so also do a paternity test if any question. ...Read more

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What is the purpose of an ultrasound in pregnancy?

What is the purpose of an ultrasound in pregnancy?

There are: multiple purposes: to confirn dates, viability, check for fetal abnormalities, check for placental abnormalities, fetal and placental position, guidance for amniocentesis or other interventions. ...Read more

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When is the best time to determine a due date in the first trimester with a sonogram?

When is the best time to determine a due date in the first trimester with a sonogram?

When for US in pregn: The best time - usually around 13 weeks of pregnancy That will be sufficient time for the baby to have grown some and usually is past the time of early pregnancy misscarriages ...Read more

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What's the most accurate, the CRL or the FL,AC, HC ? Which one gives you the most accurate fetal age ? What are the errors?

What's the most accurate, the CRL or the FL,AC, HC ? Which one gives you the most accurate fetal age ? What are the errors?

All of the above.: I am not an Obstetrician, but as I understand it, no one measurement is "most accurate" for fetal age. That is why all are measured together - some sort of average of all the measurements is the best indicator of gestational age. Every baby is different, & due to genetics some babies will have larger heads for a given age, others will have long legs. So doctors follow growth of all parts over time ...Read more

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Is the appearance of visible blue veins in breasts and around the nipple a good indication of pregnancy the week period is due to arrive?

Is the appearance of visible blue veins in breasts and around the nipple a good indication of pregnancy the week period is due to arrive?

Not necessarily.: Blue veins around the nipple and on the breasts can increase with pregnancy but are not an indication of being pregnant. Veins on the breast can occur for many reasons including genetics, levels of hydration, body temperature and stress. These veins tend to be more prominent in fair skinned women and and usually a variations of normal findings. ...Read more

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Is the age shown on an ultrasound measured from LMP or conception? The US said 5w1d. If this is from LMP, conception would be after I got a pos. test

Is the age shown on an ultrasound measured from LMP or conception? The US said 5w1d. If this is from LMP, conception would be after I got a pos. test

From LMP but..: ...If the sonographic dating was obtained from measuring the "mean gestational sac size", its margin error may be wide and it may be inaccurate. If it was determined from the average of 3 measurements of a "crown rump length" by a certified experienced sonographer, it is more reliable and precise. A repeat scan in a few weeks may be valuable. ...Read more

Dr. Marvin Ott
4 doctors shared insights

Pregnancy (Definition)

When your due date arrives, you will be more than ready to have your baby! Most women deliver the baby somewhere between 37 and 42 weeks. According to the American College of Obstetricians and Gynecologists, only 5% of babies arrive on the exact due date. Approximately 7% of babies are not delivered by 42 weeks, and when that happens, it is referred to ...Read more