Ultrasound dating of pregnancy accuracy

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.
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When LMP and Ultrasound Dates Don’t Match: When to Redate?

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Dating your Pregnancy | The MotHERS Program™

Calculate estimated due date EDD and gestational age based on: Because the human egg is capable of fertilization for only 12 to 24 hours after ovulation the date of ovulation may be taken as being the date of conception. However, ultrasound determination of the date of ovulation has the same imprecision as does the ultrasound estimate of the gestational age and, therefore, a precise date of conception cannot usually be determined as with in vitro fertilization. In addition, although a woman is most likely to become pregnant if she has sex on the day of ovulation conception may also occur from live sperm still in her reproductive tract on the day of ovulation if she had sex for up to five days before ovulation [26,27]. The due date may be estimated by adding days 9 months and 7 days to the first day of the last menstrual period LMP. This is the method used by "pregnancy wheels".
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Predicting delivery date by ultrasound and last menstrual period in early gestation.

NCBI Bookshelf. John A. Morgan ; Danielle B. Authors John A.
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For many women, especially after 8 weeks gestation, sufficient information about the baby may be obtained with transabdominal ultrasound only. However, in the early pregnancy, the developing embryo is very small at 6 weeks gestation, the baby is only mm long and a transvaginal ultrasound may be required to get a better image of the baby. Transvaginal ultrasound is safe and commonly performed during all stages of pregnancy, including the first trimester. It will not harm you or your baby. Transabdominal ultrasound involves scanning through your lower abdomen.
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