Doctor insights on:
How Accurate Are Ultrasounds In Determining Gender
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
Depends: The precision of an ultrasound depends somewhat on the equipment, the technician, the interpreter & the reason for study. If the scan is done to verify the placental location, fetal position & head size(to verify dates), simple equipment works ok. Specific things about baby like heart anatomy, facial features and the like, require a skilled technician using special equipment & interpretation. ...Read moreSee 1 more doctor answer
US dating: The earlier the ultrasound the better the dates. ...Read more
Very accurate: Over 99%Get a more detailed answer ›
Depends when: Early ultrasounds (before 8 weeks) are accurate within about 3 days. As time goes by, ultrasound measurements become less useful in determining your due date, and likely conception date. ...Read more
Early Ultrasounds: The early ultrasounds are considered the most accurate. ...Read more
No known stats.: First, this is not the ultrasound usually done today, transvaginal is. This is done with a manual pelvic exam and ca-125 levels. Second, there has not been a prominent study that I have seen that determines the accuracy of diagnosis by this test. The most accurate way is probably surgery, where specimens can be taken and examined under a microscope to see if it is cancer. ...Read moreSee 1 more doctor answer
Very accurate if ...: Done by trained, competent ultrasound technologist or radiologist/ob/gyn physician. The most accurate measurement for dating is the crown-rump length at between 7 and 13 weeks gestation. Accuracy is +/- 8%, or approximately +/- 4 days at 8 weeks gestation. ...Read moreSee 2 more doctor answers
The most accurate: The earlier you get your first ultrasound, the more accurate is the estimate of your due date and the age of the pregnancy. During the first trimester, the dates are within about a week of the actual conception date. Later in the second trimester, you can be at least 2 weeks off. If you were to present for your first sono in the third trimester there can be 3 or more weeks of uncertainty of dates. ...Read more
Very accurate: If done in the 1st trimester and done via transvaginal approach, it is accurate to 5-7 days ...Read more
Pretty exact: If and only if down correctly - they are within +/-2-3 days. ...Read more
Very accurate: Ultrasounds tend to get more inaccurate as your pregnancy progresses. First trimester ultrasounds are more accurate than second trimester ultrasounds, which are in turn more accurate than third trimester ultrasounds. First trimester ultrasounds can reliably predict gestational age within 5-7 days. ...Read moreSee 1 more doctor answer
Should be accurate: Within about 4-5 days either way.Get a more detailed answer ›
How accurate are 1st trimester ultrasounds in estimating gestational age? What about 2nd trimester ultrasounds?
Accurate!: 1st trimester ultrasounds are very accurate - have correlated with timed ivf pregnancies. We usually consider 1st trimester scans accurate within 5-7days' 2nd trimester scans within 10-14days. ...Read more
How accurate are second and third trimester sonogram measurements in figuring date of conception?
How accurate are the doctors measurements of the baby to determine baby weeks, due date, conception, ovulation etc...
Pregnancy dating: I assume you are talking about ultrasound measurements. The accuracy depends on when the ultrasound is performed-- an early ultrasound (8-10 weeks) is accurate to within a few days. Later ultrasounds are much less accurate and may have a margin of error of up to 3 weeks in the late 3rd trimester. ...Read more
How accurate are the doctors measurements of the baby to determine baby weeks, due date, conception, ovulation etc.?
Depends on variables: Early projections are based on a woman's history which can be inaccurate.Later data derived from an ultrasound and or other measures tend to be more consistent. Late gestation ultrasounds can either confirm or adjust projected dates. ...Read more
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