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  2. Fetal pole - Wikipedia

    en.wikipedia.org/wiki/Fetal_pole

    The fetal pole is a thickening on the margin of the yolk sac of a fetus during pregnancy. It is usually identified at six weeks with vaginal ultrasound and at six and a half weeks with abdominal ultrasound . [ 1 ]

  3. 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 sac, eventually reducing the extraembryonic coelom (the gestational sac or the chorionic cavity) to a thin layer ...

  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. Anthropometric measurement of the developing fetus - Wikipedia

    en.wikipedia.org/wiki/Anthropometric_measurement...

    Fetal height, fetal weight, head circumference (HC), crown to rump length (CR), dermatological observations like skin thickness etc. are measured individually to assess the growth and development of the organs and the fetus as a whole and can be a parameter for normal or abnormal development also including adaptation of the fetus to its newer ...

  6. Obstetrics - Wikipedia

    en.wikipedia.org/wiki/Obstetrics

    A normal gestation would reveal a gestational sac, yolk sac, and fetal pole. [28] The gestational age can be assessed by evaluating the mean gestational sac diameter (MGD) before week 6, and the crown-rump length after week 6. Multiple gestation is evaluated by the number of placentae and amniotic sacs present. [29]

  7. 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.

  8. Blighted ovum - Wikipedia

    en.wikipedia.org/wiki/Blighted_ovum

    When small, the sac cannot be distinguished from the early normal pregnancy, as there may be a yolk sac, though a fetal pole is not seen. In anembryonic pregnancy, levels of the pregnancy hormone human chorionic gonadotropin (hCG) typically rise for a time, which can cause positive pregnancy test results and pregnancy symptoms such as tender ...

  9. Prenatal nutrition - Wikipedia

    en.wikipedia.org/wiki/Prenatal_nutrition

    Measured values from ultrasonography are compared with the growth chart to estimate fetal weight. [ 24 ] Crown-rump length can be used as the best ultrasonographic measurement for correct diagnosis of gestational age during the first trimester. [ 23 ]