Assessment of the Number of Umbilical Cord Vessels at the Time of Nuchal Translucency Screening
نویسنده
چکیده
Nuchal translucency (NT) thickness is utilized as a screening test in prenatal assessment of risk of aneuploidy in the first trimester. This test is performed between 11.0-13.9 weeks gestational age, corresponding to a crown-rump length (CRL) of 45-84mm. Alone, or in combination with maternal serum analytes of pregnancy-associated plasma protein A (PAPP-A) and beta human chorionic gonadotropin (ß-HCG), NT can detect 6470% or 82-87% of Down syndrome cases, respectively, assuming a 5% screen positive rate [2] Physicians and sonographers performing NT screening undergo an initial certification process and ongoing quality review to maintain accreditation and ensure consistent results.
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