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  2. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    The sex of the fetus may be discerned by ultrasound as early as 11 weeks' gestation. The accuracy is relatively imprecise when attempted early. [15] [16] [17] After 13 weeks' gestation, a high accuracy of between 99% and 100% is possible if the fetus does not display intersex external characteristics. [18]

  3. Nuchal scan - Wikipedia

    en.wikipedia.org/wiki/Nuchal_scan

    At 12 weeks of gestational age, an "average" nuchal thickness of 2.18mm has been observed; however, up to 13% of chromosomally normal fetuses present with a nuchal translucency of greater than 2.5mm. Thus for even greater accuracy of predicting risks, the outcome of the nuchal scan may be combined with the results of simultaneous maternal blood ...

  4. Crown-rump length - Wikipedia

    en.wikipedia.org/wiki/Crown-rump_length

    An ultrasound showing an embryo measured to have a crown-rump length of 1.67 cm and estimated to have a gestational age of 8 weeks and 1 day. 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).

  5. How Texas 'miracle baby' might have been saved by his twin ...

    www.aol.com/news/texas-miracle-baby-might-saved...

    At 13 weeks pregnant, Vogas felt a "pop." She ran to the bathroom and realized her water had broken. An ultrasound showed that Wally's amniotic sac had ruptured, and he had very little amniotic fluid.

  6. Prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Prenatal_testing

    At early presentation of pregnancy at around 6 weeks, early dating ultrasound scan may be offered to help confirm the gestational age of the embryo and check for a single or twin pregnancy, but such a scan is unable to detect common abnormalities. Details of prenatal screening and testing options may be provided.

  7. Here's what pregnancy actually looks like before 10 weeks ...

    www.aol.com/lifestyle/heres-pregnancy-actually...

    Women’s health expert Dr. Jennifer Wider tells Yahoo Life that “weeks 5 to 9 is the early time period in a pregnancy. At 5 weeks, the embryo is a mass of cells with a developing neural tube ...

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