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Why and when is Ultrasound used in Pregnancy? ... This measurement can be made between 7 to 13 weeks and gives very accurate estimation of the gestational age. Dating with the CRL can be within 3-4 days of the last menstrual period.
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www.ob-ultrasound.net/
www.ob-ultrasound.net/
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Of all of these uses, dating the pregnancy is the most common reason to use ultrasound, ... It is not uncommon for babies that are labeled "Large for Gestational Age (LGA)" and "IntraUterine Growth Restriction (IUGR)" to have monthly or even weekly ultrasounds during the pregnancy. ... So how accurate is ultrasound?
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www.babyzone.com/askanexpert/uses-accuracy-of-ultrasoun...
www.babyzone.com/askanexpert/uses-accuracy-of-ultrasound
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The heartbeat may not be detected for reasons that include: tipped uterus, larger abdomen, or inaccurate dating with last menstrual period. Heartbeats are best detected with transvaginal ultrasounds early in pregnancy. ... How accurate are ultrasounds in calculating gestational age? Your healthcare provider will use...
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www.americanpregnancy.org/prenataltesting/ultrasound.ht...
www.americanpregnancy.org/prenataltesting/ultrasound.html
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ANSWER: Dear Laura, Ultrasounds done before the 12th week of pregnancy are very accurate for dating purposes. Most often on the ultrasound report that they print out for you it will say something like "6W5D +/-3D" or something similar to that.
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en.allexperts.com/q/ObGyn-Pregnancy-issues-1007/accurat...
en.allexperts.com/q/ObGyn-Pregnancy-issues-1007/accurate-dating-ultrasounds-1.htm
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Ultrasound for Dating the Pregnancy ... What the test measures and how accurate it is ... Although abdominal ultrasounds definitely work on heavy women later on in pregnancy, sometimes they are not very effective earlier in pregnancy. Thus transvaginal ultrasounds are especially common in women of size early in pregnancy.
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www.plus-size-pregnancy.org/Prenatal%20Testing/prenatal...
www.plus-size-pregnancy.org/Prenatal%20Testing/prenataltest-ultrasoundsafety.htm
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If your cycle is quite irregular, you may have great difficulty dating your pregnancy. If you have records showing when you ovulate (either by charting or by ovulation predictor kits), then these can be used to help determine a more accurate due date. ... However, ultrasounds up to week 20 or so can help place the dating,
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www.plus-size-pregnancy.org/figuring.htm
www.plus-size-pregnancy.org/figuring.htm
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An ultrasound is accurate to within a couple of days if done at 8 weeks. At 20 weeks it is accurate to within a week. After this babies grow at such diffeerent rates that it becomes increasingly less accurate.
http://wiki.answers.com/Q/Is_an_ultrasound_more_accurat...
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Therefore, early ultrasounds can often be fairly good indicators of fetal age. However, past the first trimester, babies grow at very different rates, so size is much less accurate for determining fetal age. Up to 20 weeks, the margin of error is +/- 7-10 days. ... However, even with multiple methods for dating the pregnancy,
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transitiontoparenthood.com/ttp/birthed/duedatespaper.ht...
transitiontoparenthood.com/ttp/birthed/duedatespaper.htm
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We will want to do serial ultrasounds every few days to determine if normal development is taking place. ... Measuring the length of the embryo (we call it a crown-rump length) at this stage of pregnancy gives us very accurate dating of the pregnancy, plus or minus 3 or 4 days. The further along in pregnancy the first dating...
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www.obgynsono.com/overview.html
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