How accurate are crl in dating pregnancy

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Read terms. Pettker, MD; James D. Goldberg, MD; and Yasser Y. This document reflects emerging clinical and scientific advances as of the date issued and is subject to change.
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Methods for Estimating the Due Date

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Crown rump length | Radiology Reference Article | nonviolentchoice.info

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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How accurate is dating by CRL? dating ultrasound results...............?

Metrics details. Fetal ultrasound scanning is considered vital for routine antenatal care with first trimester scans recommended for accurate estimation of gestational age GA. A reliable estimate of gestational age is key information underpinning clinical care and allows estimation of expected date of delivery.
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Crown-rump length CRL is the measurement of the length of human embryos and fetuses from the top of the head crown to the bottom of the buttocks rump. It is typically determined from ultrasound imagery and can be used to estimate gestational age. The embryo and fetus float in the amniotic fluid inside the uterus of the mother usually in a curved posture resembling the letter C.
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