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  2. Crown-rump length - Wikipedia

    en.wikipedia.org/wiki/Crown-rump_length

    Ultrasound image of the foetus at 12 weeks of pregnancy in a sagittal scan. Measurements of fetal Crown Rump Length (CRL). The embryo and fetus float in the amniotic fluid inside the uterus of the mother usually in a curved posture resembling the letter C. The measurement can actually vary slightly if the fetus is temporarily stretching ...

  3. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    The heartbeat is usually seen on transvaginal ultrasound by the time the embryo measures 5 mm, but may not be visible until the embryo reaches 19 mm, around 7 weeks' gestational age. [5] [11] [12] Coincidentally, most miscarriages also happen by 7 weeks' gestation. The rate of miscarriage, especially threatened miscarriage, drops significantly ...

  4. Nuchal scan - Wikipedia

    en.wikipedia.org/wiki/Nuchal_scan

    The use of a single millimeter cutoff (such as 2.5 or 3.0 mm) is inappropriate because nuchal translucency measurements normally increases with gestational age (by approximately 15% to 20% per gestational week from 10 to 13 weeks). [10] At 12 weeks of gestational age, an "average" nuchal thickness of 2.18mm has been observed; however, up to 13% ...

  5. Twin brothers born conjoined celebrate 1st birthday after ...

    www.aol.com/twin-brothers-born-conjoined...

    When a routine ultrasound 12 weeks into her pregnancy showed that her sons were conjoined, Shaneka Ruffin said it was recommended to her that she terminate her pregnancy.

  6. Obstetrics - Wikipedia

    en.wikipedia.org/wiki/Obstetrics

    The newer integrated screen (formerly called F.A.S.T.E.R for First And Second Trimester Early Results) can be done at 10 plus weeks to 13 plus weeks with an ultrasound of the fetal neck (thicker nuchal skin correlates with higher risk of Down syndrome being present) and two chemicals (analytes), pregnancy-associated plasma protein A and human ...

  7. 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.

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