How accurate are dating scans at predicting due date

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For instance, the EDD for a pregnancy that resulted from in vitro fertilization should be assigned using the age of the embryo and the date of transfer. University of Florida. The duration of pregnancy from the scan to the day of spontaneous delivery was predicted by crown-rump length, biparietal diameter BPDand femur length FL using linear regression models, and the results were compared with estimates based on LMP. Thread Tools Show Printable Version. Older women were more likely to have longer pregnancies than their younger counterparts. Given this statistic, it leads to the question: Fetal crown—rump length:

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Even early scans aren't always accurate.

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Predicting delivery date by ultrasound and last menstrual period in early gestation.

Given this statistic, it leads to the question: I know when both of my girls were conceived and worked out the "due date" from there - the scans showed a "due date" only one day out from our dates so they were pretty much spot on for working out conception dates. Because few women know the exact day they ovulated or conceived, an ultrasound done in the first trimester of pregnancy has been shown to the be the most accurate way to date a pregnancy. Though most women are given an official due date, it is often just a rough estimate. That's why manual exams don't predict labor very well: My next scan at 12w3d gave the 16 March 08 as his EDD. To answer that question, Berghella looked at five studies in which researchers used ultrasounds to measure cervical length of a total of pregnant women.

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