How Accurate Is the 12-Week Scan for Detecting Down’s Syndrome?

Learn about the accuracy of the 12-week scan and blood test for Down’s syndrome screening and next steps for diagnosis.

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The 12-week scan for Down's syndrome, also known as the nuchal translucency scan combined with the blood test, can detect about 90% of cases. It’s a part of the screening process that offers a risk assessment rather than a definitive diagnosis. For a more accurate diagnosis, follow-up tests like amniocentesis or chorionic villus sampling (CVS) are recommended. Remember, these screening results only indicate a likelihood, not a certainty, and should be discussed with a healthcare professional for comprehensive understanding and guidance.

FAQs & Answers

  1. What is the accuracy rate of the 12-week scan for Down’s syndrome? The 12-week nuchal translucency scan combined with a blood test detects around 90% of Down’s syndrome cases, providing a risk assessment rather than a definitive diagnosis.
  2. What are the next steps if a 12-week scan indicates a higher risk of Down’s syndrome? If the screening shows increased risk, follow-up diagnostic tests like amniocentesis or chorionic villus sampling (CVS) are recommended to confirm the diagnosis.
  3. Does the 12-week scan provide a definitive diagnosis for Down’s syndrome? No, the 12-week scan is a screening test that estimates risk; only invasive tests like amniocentesis or CVS can provide a definitive diagnosis.

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