Dating pregnancy ultrasound accuracy

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To get a definitive 100% answer for chromosome abnormalities including Down syndrome, a prenatal diagnostic test is needed (chorionic villus sampling or amniocentesis).Chorionic villus sampling and amniocentesis are invasive tests, involving putting needles into the placenta or amniotic sac, and they are associated with an increased risk of miscarriage.

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Occasionally, patients need to return on another day if the baby remains in an unhelpful position.The transvaginal ultrasound probe is thin, about 2cm diameter.The probe is covered with a disposable protective sheath.For example, it tells us whether your baby has a low risk of having trisomy 13, 18 or 21, or whether your baby has a high risk of having trisomy 13, 18 or 21.This test gives us an indication of whether we should worry about your baby based on these results.

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