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  2. Gestational sac - Wikipedia

    en.wikipedia.org/wiki/Gestational_sac

    The mean sac diameter [3] can effectively estimate the gestational age [4] between 5 and 6 weeks, with an accuracy of about +/- 5 days. [ 5 ] The yolk sac and embryo should be readily identifiable when the gestational sac reaches a certain size — a yolk sac should be seen when the gestational sac is 20mm and a fetal pole should be seen when ...

  3. Monoamniotic twins - Wikipedia

    en.wikipedia.org/wiki/Monoamniotic_twins

    Ultrasound is the only way to detect monoamniotic-monochorionic twins before birth. [4] It can show the lack of a membrane between the twins after a couple of weeks' gestation, when the membrane would be visible if present.

  4. 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.

  5. Can you get pregnant again while already pregnant? Experts ...

    www.aol.com/lifestyle/pregnant-again-while...

    A couple of weeks later, a follow-up ultrasound revealed the addition of twins who were conceived six days after their sister. Another mom, Rebecca Roberts, conceived her twins weeks apart. She ...

  6. See the moment twins who were separated in the NICU ... - AOL

    www.aol.com/news/see-moment-twins-were-separated...

    Huston was 32 weeks pregnant went she went into labor. ... One twin, Declan, was born at 6:04 pm. The other, River, was born one minute later. ... "They did an ultrasound, found two yolk sacs, and ...

  7. 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]

  8. Pregnancy test - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_test

    With obstetric ultrasonography the gestational sac (intrauterine fluid collection) can be visualized at 4.5 to 5 weeks gestation, the yolk sac at 5 to 6 weeks gestation, and fetal pole at 5.5 to 6 weeks gestation. Ultrasound is used to diagnose multiple gestation, which cannot be diagnosed based on the presence of hCG in urine or blood. [15]

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

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

    Conjoined twins occur roughly once in every 35,000 to 80,000 births, according to Children's Hospital of Philadelphia, which has performed over 30 conjoined twin separations since the 1950s.

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