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Obstetric dating criteria

Crown rump length CRL is the length of the embryo or fetus from the top of its head to bottom of torso. CRL is measured as the largest dimension of embryo, excluding the yolk sac and extremities. It is used as a primary measure of gestational age between weeks. The earlier in pregnancy a scan is performed, the more accurate the age assignment from crown rump length 4.
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Pregnancy (Due Date) Calculator

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First trimester | Radiology Reference Article | shirt-print.info

Read terms. Fretts, MD; Uma M. Turrentine, MD. In developed countries, the most prevalent risk factors associated with stillbirth are non-Hispanic black race, nulliparity, advanced maternal age, obesity, preexisting diabetes, chronic hypertension, smoking, alcohol use, having a pregnancy using assisted reproductive technology, multiple gestation, male fetal sex, unmarried status, and past obstetric history. Although some of these factors may be modifiable such as smoking , many are not. The study of specific causes of stillbirth has been hampered by the lack of uniform protocols to evaluate and classify stillbirths and by decreasing autopsy rates.
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Guidelines

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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Like other travelers, pregnant women should use seat belts while seated. Most commercial airlines allow pregnant women to fly up to 36 weeks of gestation, with some restrictions on international flights. ACOG does not recommend air travel for pregnant women with medical or obstetric conditions that may be exacerbated by flight or that could require emergency care. It advises checking flight durations when planning travel and that the most common obstetric emergencies occur in the first and third trimesters.
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