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What Is The Margin Of Error At Dating Scan
Are ultrasounds done at 13 weeks pregnant accurate? What is the margin error of dating scans performed at this stage of the pregnancy?
Yes, fairly accurate: The margin of error on a dating scan at 13 weeks is approximately 7 days. ...Read more
What is the error of margin for an ultrasound dating at 11 week 4 day, measuring the fetus crl at 4.8 cm?
Plus or minus, 5 day: The margin of error at that gestational age is typically + or minus 5 days. That crl is definitely normal for that gestational age. ...Read more
See below: About 7 to 8 days.Get a more detailed answer ›
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
Yes if: 1) the pregnancy's abnormal and hence not the correct size, 2) the sonographer mismeasured or miscalculated. Otherwise, not really. ...Read more
What is the margin of error for an abdominal ultrasound in the first trimester. Around 11 weeks. Would vaginal be more accurate?
Millions of uses: Utilizing fundal height as a rough landmark for gestional age has been in use for an extremely long time, predating ultrasound and rapid blood testing. It is generally accurate, non-invasive, easily repeated, easily measured, and relatively painless. See: http://en.Wikipedia.Org/wiki/fundal_height for brief synopsis, or google "fundal height" or "mcdonald's rule for more info. ...Read more
Do transvaginal US have the same margin of error as abdominal US in the dating pregnancy the first trimester?
Slightly less: Transvaginal sonograms are slightly more accurate in the early first trimester. Either way the margin of error is only about 3-5 days. ...Read more
What is the likelihood of miscarriage if the ultrasound notes the fetus is 'low in the uterus' at 2 months? Any literature quoting a percentage?
The low down on PG: All pregnancies are low in the uterus at only 8 weeks gestation prior to uterine expansion lifting them up into the fundus in the 2nd trimester. ...Read more
Are abdominal ultrasounds as accurate for dating as vaginal around 11 weeks of pregnancy? What is the margin of error for abdominal at this gestation?
Whats the error of margin for u/s dating at 11w4days on 01/20/14 with edd of 8/08/14 as far as conception date? Is 11/25/13 eliminated from conception
You should be: Discussing all of this with your OB since your OB should answer any dating questions you have any any ?S about conception date with that us conception would be 11/15 as your OB could have figured out, us should be acurrate + or - 3-4 days but ask your OB what their range is. ...Read moreSee 2 more doctor answers
I notice on my ultrasound scan at the top, it say "ga(lmp)=06w6d" what does that mean? Is that a measurement of the baby determined by the ultrasound?
Gestational age (GA): = how many weeks pregnant you are from the first day of your last menstrual period (lmp) to the date of the exam. It estimates your due date within 4-6 days. Full term gestation = 38-42 weeks. Conceptional age = time since implantation, often known when assistive reproductive techniques are used. It's 2 weeks < than gestational age. The baby center's free app, " my pregnancy today" is useful. ...Read moreSee 2 more doctor answers
If accuracy of scans r supposed to be excellent in 1st trimester, particularly at 8-10 weeks gestation, then why is there an error margin of +/- 7dys?
Math: There is a margin of error in everything is life. In sonography the margin exists because of the mathematics involved in measuring a fetus and then applying those measurement to standardized algorithms that establish the gestational age. The further along the wider the margin or error as one fetus begins to individualize. ...Read more
Is the margin of error in a 1st trim ultrasound based on error of measurements or assigning a due date? I hear diff things about how "off" they can be
Gestational age: It is reported as number of days that gestational age could be off, in days. Assuming that babies all mature similarly (a fairly good assumption within a week or two) this also applies to expected delivery date. You have asked at least 3 questions about this topic. I suggest you read something more definitive such as this http://www.Nlm.Nih.Gov/medlineplus/pregnancy.Html. ...Read more
What's the error margin with conception dates with an transvaginal ultrasound done at 9 weeks of pregnancy?
5 days: Typically it's plus or minus 5 days. ...Read more
Would the gestational age of 12wks+4days @62mm be off by 1 week since ultrasounds have a margin of error of 1 week in the first trimester?
Estimates: Determination of gestational age is based on estimates determined by the last menstrual period and ultrasound. There is a margin of error with ultrasound, but that does not mean that the gestational age is necessarily different by a week. It means that the ultrasound estimate is 12w4d with a very high likelihood that the actual age is between 11+ to 13+ weeks. ...Read moreSee 2 more doctor answers
What is the margin for error of an ultrasound at 15 weeks? Preg confirmed at about 11 wks, wouldn't US have been done then?
Fetal Ultrasound: An Ultrasound may be done prior to 18-21 weeks gestation if a patient is unsure of her dates or there is a question of whether the pregnancy is within the uterus and not ectopic, i.e. tubal pregnancy or.if the patient is having vaginal bleeding, ultrasound may be performed to confirm whether the fetus is still living. Otherwise, the first ultrasound is usually done at 18-21 weeks. ...Read more
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