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Related Experiment Videos

[Alpha-fetoprotein and trisomy 21].

S Guibaud1, C Boisson, A Simplot

  • 1Laboratoire de Biochimie, Hôpital de la Croix-Rousse, Lyon.

Journal De Genetique Humaine
|August 1, 1988
PubMed
Summary
This summary is machine-generated.

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Maternal serum alpha-fetoprotein (AFP) levels are lower in Down syndrome pregnancies. Screening using AFP levels below 0.5 MoM may incorrectly identify normal pregnancies as high-risk for Down syndrome.

Area of Science:

  • Biochemistry
  • Genetics
  • Prenatal Diagnostics

Context:

  • Down syndrome (trisomy 21) is a common genetic disorder.
  • Maternal serum alpha-fetoprotein (AFP) is a biomarker used in prenatal screening.
  • Accurate screening is crucial for timely intervention and genetic counseling.

Purpose:

  • To evaluate the utility of maternal serum AFP levels in screening for fetal Down syndrome.
  • To determine the effectiveness of specific AFP cutoff values in distinguishing affected from unaffected pregnancies.
  • To identify potential limitations and challenges in using maternal serum AFP for Down syndrome screening.

Summary:

  • In pregnancies affected by Down syndrome, the median maternal serum AFP was 0.76 MoM, significantly lower than normal.

Related Experiment Videos

  • Median amniotic fluid AFP levels were near normal (0.98 MoM) in affected pregnancies.
  • Using a cutoff of 0.5 MoM for maternal serum AFP resulted in 4.1% of normal gestations having values below this threshold, indicating potential false positives.

    • Impact:

    • Highlights the limitations of maternal serum AFP screening for Down syndrome, particularly with lower cutoff values.
    • Suggests that relying solely on maternal serum AFP may lead to unnecessary anxiety and further invasive testing in normal pregnancies.
    • Emphasizes the need for improved or combined screening strategies for accurate Down syndrome detection.