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What Is the False Positive Rate for Trisomy 21 on NIPT?

Learn about the false positive rate of NIPT for trisomy 21 and why confirmatory diagnostic testing is essential.

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Video transcript

Non-invasive prenatal testing (NIPT) for trisomy 21 typically has a false positive rate of around 0.1%. This means that in a small percentage of cases, the test may indicate a positive result when the condition is not actually present. Always confirm with a diagnostic test.

Questions and answers

  1. What is the false positive rate of NIPT for trisomy 21?

    NIPT for trisomy 21 typically has a false positive rate of approximately 0.1%, meaning false positives are rare but possible.

  2. Why should a positive NIPT result be confirmed with diagnostic testing?

    Because NIPT is a screening test with a small chance of false positives, confirmatory diagnostic tests like amniocentesis provide definitive diagnosis.

  3. How accurate is NIPT in detecting trisomy 21?

    NIPT is highly accurate with sensitivity and specificity rates typically over 99% for trisomy 21, but it is not 100% definitive.

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For more detailed information on prenatal screening and diagnostic options, explore our related videos on NIPT procedures, genetic counseling, and the differences between screening and diagnostic testing for chromosomal abnormalities.