Doctor insights on:
How Reliable Are Dating Scans
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
Variable accurancy: The accuracy of MRI depends a great deal on the person who is being scanned being able to hold still during the scan. Motion artifact is the most common artifact that decreases the accuracy of an MRI. The overall accuracy also depends on if the right type of MRI is ordered and if contrast is used where needed. ...Read moreSee 1 more doctor answer
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
US dating: The earlier the ultrasound the better the dates. ...Read more
Being Pregnant: Yes. The early ones are thought to be more accurate than later in pregnancy. You can verify dating with a conception calculator. Remember all the tools you need to learn or monitor you pregnancy are available online. Here is where I recommend you start: http://www.babymed.com/conception-calculator ...Read more
Good exam. : CTA very accurate. CTA must be tailored to your problem to be the most accurate. Sometimes Doppler ultrasound, magnetic resonance angiography/ MRA, or conventional angiography are required instead. See radiologyinfo.org for details about these studies. ...Read moreSee 1 more doctor answer
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
Depends: On what ?S are being asked. Best time to date the age of the fetus is 8-13 weeks. Best time to evaluate the anatomy is 18-22 weeks. As they get older, there is less accuracy, since all fetuses (like their parents) are different. Older fetuses are bigger, so it can be easier to see somethings, but it is more likely some part of the fetus will be in the way of what you are trying to look at. ...Read more
Are 11 week ultrasound more accurate for dating conception than 6 week ultrasound, both are transvaginal?
Not necessarily: Due dating pregnancies is more accurate with more than one ultrasound performed. However, the 6 week ultrasound might be more accurate in dating your conception. Either way ultrasounds have a 'fudge factor' of 1 to 2 weeks in determining accuracy. ...Read more
How accurate are 6 week ultrasounds and why do some babies come 2 weeks early if ultrasounds are accurate?
Fairly accurate: Onset of labor and delivery depends on multiple factors, mostly maternal, and estimates are that 10% of infants are born earlier than 37 weeks. Age of mother, prenatal care, size and number of babies, uterine shape, maternal smoking or drugs, previous cervical cone biopsy and maternal infection are the most common. ...Read more
Utility of the EEG: An EEG measures the brain waves. If one is obtained during a seizure, they are diagnostic for seizure. This is much better than seeing a seizure with our eyes. The EEG is also helpful for monitoring brain activity during sleep and alertness, coma and confusion. ...Read moreSee 1 more doctor answer
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
Not exactly: while an ultrasound in the third trimester can give you an idea based on size of the fetus, they are only accurate +/- 3 weeks. If the fetus is having growth restriction or is large for age, they will be off. If there is a fluid problem, they will be off. The best time in a pregnancy to obtain dating via ultrasound is the first trimester. Good luck! ...Read moreSee 1 more doctor answer
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
Depends: Home pregnancy tests measure the amount of beta human Chorionic Gonadotropin hormone in urine. It takes about 1 week after conception for beta HCG to become detectable in the blood and 2 weeks for it to become detectable in urine. If it has not been 2 weeks since your missed period, your home pregnancy test may be falsely negative. ...Read moreSee 1 more doctor answer
Yes: Ultrasound dating is most accurate early in the pregnancy using the crown-rump length (crl) of the small fetus. The measurement can be done starting around 6 weeks. While crl can be used for dating until 12 weeks, it is most accurate during 6-8 weeks when the accepted error is only about 3 days from actual date. ...Read more
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