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What Does a 3.5% Fetal Fraction Mean in Non-Invasive Prenatal Testing (NIPT)?

Learn what a 3.5% fetal fraction means in prenatal DNA testing and why a minimum of 4% fetal fraction is needed for accurate NIPT results.

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Video transcript

A 3.5% fetal fraction refers to the percentage of fetal DNA present in the mother's blood sample used for non-invasive prenatal testing (NIPT). For accurate results, a minimum fetal fraction of around 4% is generally required. A lower percentage may necessitate a repeat test.

Questions and answers

  1. What is fetal fraction in non-invasive prenatal testing?

    Fetal fraction is the percentage of fetal DNA present in a mother's blood sample used for NIPT to screen for genetic conditions.

  2. Why is a minimum fetal fraction required for accurate NIPT results?

    A minimum fetal fraction, typically around 4%, is required to ensure enough fetal DNA is present for reliable analysis and accurate results.

  3. What happens if the fetal fraction is below 4% in an NIPT test?

    If the fetal fraction is below the required threshold, like 3.5%, the test may be inconclusive or less accurate and doctors usually recommend a repeat test.

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For more insights on prenatal testing and understanding your NIPT results, explore our related videos and articles covering fetal fraction thresholds, test accuracy, and next steps if results are inconclusive.