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  2. Estimated date of delivery - Wikipedia

    en.wikipedia.org/wiki/Estimated_date_of_delivery

    About 80% of childbirths occur between 37 and 41 weeks of gestational age, with a somewhat more narrow span when based on first trimester ultrasound. [11] Given that these gestation lengths are only estimates of an average, it is helpful to consider gestation time as a range of dates rather than as a single "due date".

  3. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    Research shows that routine obstetric ultrasound before 24 weeks' gestational age can significantly reduce the risk of failing to recognize multiple gestations and can improve pregnancy dating to reduce the risk of labor induction for post-dates pregnancy. There is no difference, however, in perinatal death or poor outcomes for infants. [3]

  4. Maternal physiological changes in pregnancy - Wikipedia

    en.wikipedia.org/wiki/Maternal_physiological...

    Women are 4-5 times more likely to develop a clot during pregnancy and in the postpartum period than when they are not pregnant. [25] Hypercoagulability in pregnancy likely evolved to protect women from hemorrhage at the time of miscarriage or childbirth. In developing countries, the leading cause of maternal death is still hemorrhage. [25]

  5. Human chorionic gonadotropin - Wikipedia

    en.wikipedia.org/wiki/Human_chorionic_gonadotropin

    The hCG levels grow exponentially after conception and implantation. [21] hCG levels typically peak around weeks 8-11 of pregnancy and are generally higher in the first trimester compared to the second trimester. The following is a list of serum hCG levels: LMP is the last menstrual period dated from the first day of the last menstrual period

  6. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    For example, if there is a gestational age based on the beginning of the last menstrual period of 9.0 weeks, and a first-trimester obstetric ultrasonography gives an estimated gestational age of 10.0 weeks (with a 2 SD variability of ±8% of the estimate, thereby giving a variability of ±0.8 weeks), the difference of 1.0 weeks between the ...

  7. Anomaly scan - Wikipedia

    en.wikipedia.org/wiki/Anomaly_scan

    The anomaly scan, also sometimes called the anatomy scan, 20-week ultrasound, or level 2 ultrasound, evaluates anatomic structures of the fetus, placenta, and maternal pelvic organs. This scan is an important and common component of routine prenatal care . [ 1 ]

  8. The FDA Set Guidelines for 'Acceptable' Levels of Lead in ...

    www.aol.com/lifestyle/fda-set-guidelines...

    The FDA Set Guidelines for 'Acceptable' Levels of Lead in Baby Food for the First Time — but Some Experts Say It's Not Enough Stacey Leasca January 8, 2025 at 12:03 AM

  9. Calendar-based contraceptive methods - Wikipedia

    en.wikipedia.org/wiki/Calendar-based...

    However, many women have shorter luteal phases, and a few have longer luteal phases. [33] For these women, the rhythm method formula incorrectly identifies a few fertile days as being in the infertile period. [19] Roughly 30-50% of women have phases outside this range. [34] Finally, calendar-based methods assume that all bleeding is true ...

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