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  2. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    Obstetric ultrasonography, or prenatal ultrasound, is the use of medical ultrasonography in pregnancy, in which sound waves are used to create real-time visual images of the developing embryo or fetus in the uterus (womb). The procedure is a standard part of prenatal care in many countries, as it can provide a variety of information about the ...

  3. 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). It is typically determined from ultrasound ...

  4. 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]

  5. Gestational sac - Wikipedia

    en.wikipedia.org/wiki/Gestational_sac

    The gestational sac is spherical in shape, and is usually located in the upper part (fundus) of the uterus.By approximately nine weeks of gestational age, due to folding of the trilaminar germ disc, the amniotic sac expands and occupy the majority of the volume of the gestational, eventually reducing the extraembryonic coelom (the gestational sac or the chorionic cavity) to a thin layer ...

  6. Nuchal scan - Wikipedia

    en.wikipedia.org/wiki/Nuchal_scan

    Purpose. Used to screen for abnormalities in a developing fetus. A nuchal scan or nuchal translucency (NT) scan / procedure is a sonographic prenatal screening scan (ultrasound) to detect chromosomal abnormalities in a fetus, though altered extracellular matrix composition and limited lymphatic drainage can also be detected. [ 1 ]

  7. Biophysical profile - Wikipedia

    en.wikipedia.org/wiki/Biophysical_profile

    A biophysical profile (BPP) is a prenatal ultrasound evaluation of fetal well-being involving a scoring system, [ 1 ] with the score being termed Manning's score.[ 2 ] It is often done when a non-stress test (NST) is non reactive, or for other obstetrical indications. The "modified biophysical profile" consists of the NST and amniotic fluid ...

  8. Prenatal testing - Wikipedia

    en.wikipedia.org/wiki/Prenatal_testing

    Prenatal testing. To monitor maternal and fetal health and progression, as well as, detect fetal abnormalities during pregnancy. Prenatal testing is a tool that can be used to detect some birth defects at various stages prior to birth. Prenatal testing consists of prenatal screening and prenatal diagnosis, which are aspects of prenatal care ...

  9. Yolk sac - Wikipedia

    en.wikipedia.org/wiki/Yolk_sac

    Contents in the cavity of the uterus seen at approximately 5 weeks of gestational age by obstetric ultrasonography. Artificially colored, showing gestational sac, yolk sac and embryo (measuring 3 mm as the distance between the + signs). The yolk sac is the first element seen within the gestational sac during pregnancy, [1] usually at 3 days ...

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