Can a Baby Test Positive for Down Syndrome and Not Have It? Explained

Learn why a baby can test positive for Down syndrome without actually having it, and understand the difference between screening and diagnostic tests.

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Yes, a baby can test positive for Down syndrome and not have it. This is because screening tests like the nuchal translucency scan or blood tests estimate the risk rather than definitively diagnosing Down syndrome. They have false positives. Confirmatory diagnostic tests such as amniocentesis or chorionic villus sampling (CVS) are more accurate but are offered based on screening results.

FAQs & Answers

  1. What causes false positive results in Down syndrome screening? False positives occur because screening tests estimate risk based on markers like nuchal translucency or blood analytes, which can be affected by various factors unrelated to Down syndrome.
  2. How accurate are diagnostic tests like amniocentesis for detecting Down syndrome? Diagnostic tests such as amniocentesis and chorionic villus sampling (CVS) provide highly accurate results because they examine the baby's chromosomes directly.
  3. When should confirmatory testing for Down syndrome be done? Confirmatory testing is usually recommended after a positive screening result to definitively diagnose or rule out Down syndrome before birth.

Watch More

For more in-depth information, explore our videos on prenatal screening tests and diagnostic procedures, including amniocentesis risks and benefits, or learn about early detection methods for genetic conditions.

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