Sonogram dating accuracy

Redating a pregnancy may occur when there is a discrepancy between the estimated due date EDD calculated by the last menstrual period LMP and that by ultrasound. Care should be taken when redating a pregnancy, especially in the third trimester, as there may be other reasons for a fetus to be small for gestational age e. According to the ACOG redating is more reliable using the earliest available and reliable ultrasound examination surrogates. For instance, CRL in the first trimester would be more accurate than a debatable uncertain LMP or 2nd-trimester biometrics. The estimated timelines listed below mandates the redating of pregnancy when these differences happen on obstetric US exams.

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Ultrasound Accuracy for Predicting Due Dates

Redating pregnancy (ultrasound) | Radiology Reference Article | badmommy.one

Back to Pregnancy Reviews. The establishment of pregnancy dates is important not only for the mother who wants to know when to expect the delivery, it is also important for her carers, e. Various policies are applied whereby the LMP dates are used unless they have a discrepancy to the ultrasound dates of more than 7, 10 or 14 days. Reliance on LMP is fraught with various problems. But even if this date is accurate, the assumption that ovulation or conception occurs 14 days later is unfounded; there is a wide distribution with a positive skewness 3.

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Rachel uses her own experiences with infertility to write compassionate, practical, and supportive articles. Every pregnant woman wants to know her due date. But a due date calculated from last menstrual period with a due date calculator often doesn't match the due date that is estimated by ultrasound also known as a sonogram. During an ultrasound, a technician spreads a warm gel over the lower part of the abdomen, and then presses a tool called a transducer against the belly to examine the fetus using sound waves.

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