Can Down Syndrome Screening Markers Be Incorrect? Understanding Accuracy and Follow-Up Tests

Learn why Down syndrome screening markers can sometimes be wrong and the importance of follow-up diagnostic tests like amniocentesis.

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Yes, Down syndrome markers can sometimes be wrong. Screening tests, such as nuchal translucency ultrasound or blood tests, can show false positives or negatives. This is why these results are often followed up with more definitive diagnostic tests like amniocentesis or chorionic villus sampling (CVS) to confirm the diagnosis. Always discuss any concerns with a qualified healthcare professional.

FAQs & Answers

  1. Why can Down syndrome screening tests give false results? Screening tests like nuchal translucency ultrasound or blood tests are not 100% accurate and can result in false positives or negatives due to variability in test sensitivity and biological factors.
  2. What diagnostic tests confirm Down syndrome after a screening? Diagnostic tests such as amniocentesis and chorionic villus sampling (CVS) are used to definitively confirm Down syndrome following a positive or uncertain screening test.
  3. Should I be worried if my Down syndrome screening test is positive? A positive screening result does not confirm a diagnosis. It's important to discuss the results with a healthcare professional and consider confirmatory diagnostic testing.

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