What is considered the most accurate method to confirm Down syndrome after CVS or amniocentesis results?

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Multiple Choice

What is considered the most accurate method to confirm Down syndrome after CVS or amniocentesis results?

Explanation:
Definitive confirmation of Down syndrome relies on direct fetal chromosomal analysis. Fetal blood sampling via cordocentesis (PUBS) provides intact fetal blood cells suitable for rapid, direct karyotyping, allowing accurate detection of trisomy 21. Ultrasound can show markers but is not diagnostic; noninvasive prenatal testing screens risk but does not provide a definitive diagnosis; maternal blood smear has no utility for fetal karyotype. So, obtaining a fetal blood sample for chromosomal analysis yields the most accurate confirmation among these options.

Definitive confirmation of Down syndrome relies on direct fetal chromosomal analysis. Fetal blood sampling via cordocentesis (PUBS) provides intact fetal blood cells suitable for rapid, direct karyotyping, allowing accurate detection of trisomy 21. Ultrasound can show markers but is not diagnostic; noninvasive prenatal testing screens risk but does not provide a definitive diagnosis; maternal blood smear has no utility for fetal karyotype. So, obtaining a fetal blood sample for chromosomal analysis yields the most accurate confirmation among these options.

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