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  2. Obstetric ultrasonography - Wikipedia

    en.wikipedia.org/wiki/Obstetric_ultrasonography

    A gestational sac can be reliably seen on transvaginal ultrasound by 5 weeks' gestational age (approximately 3 weeks after ovulation). The embryo should be seen by the time the gestational sac measures 25 mm, about five and a half weeks. [ 10 ]

  3. Amniocentesis - Wikipedia

    en.wikipedia.org/wiki/Amniocentesis

    In 1972, ultrasound-guided amniocenteses began replacing free-handed taps following J. Bang and A. Northeved's initiative to employ ultrasound technology to improve amniocentesis. [6] [7] Up until the 1980s, static B-scan ultrasound-guidance was used for the procedure, a process that did not permit visualization of the needle in the amniotic ...

  4. Gestational age - Wikipedia

    en.wikipedia.org/wiki/Gestational_age

    If the gestational age as calculated from an early ultrasound is contradictory to the one calculated directly from the last menstrual period, it is still the one from the early ultrasound that is used for the rest of the pregnancy. [2] In case of in vitro fertilization, calculating days since oocyte retrieval or co-incubation and adding 14 days ...

  5. Fact check: Claim that pregnancy can be detected the day ...

    www.aol.com/fact-check-claim-pregnancy-detected...

    A pregnancy test detects the presence of the pregnancy hormone human chorionic gonadotropin in a person’s body. The body doesn’t produce that hormone until several days after conception.

  6. Pregnancy test - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_test

    Secretion of hCG can occur as soon as 6 days following ovulation and on average 8–10 days following ovulation; this is the earliest hCG can be detected in a blood sample. [7] [5] [8] The hCG concentration in blood is higher than in urine. Therefore, a blood test can be positive while the urine test is still negative. [9] [10]

  7. Fertility testing - Wikipedia

    en.wikipedia.org/wiki/Fertility_testing

    Various methods of predicting the timing of ovulation exist, some of which may be performed at home or in a clinical setting. Knowing the timing of ovulation can help a woman to determine the days of the menstrual cycle that are most likely to result in conception.

  8. Timeline of human prenatal development - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_human_prenatal...

    Fetal heart tone (the sound of the heart beat) can be heard using doppler. Nipples and hair follicles begin to form. Location of the elbows and toes are visible. Spontaneous limb movements may be detected by ultrasound. All essential organs have at least begun. The vitelline duct normally closes.

  9. 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).