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Related Experiment Videos

Risks for fetal abnormalities after very and moderately elevated AF-AFPs

B F Crandall1, C Chua

  • 1Department of Psychiatry, University of California, Los Angeles School of Medicine, USA.

Prenatal Diagnosis
|October 8, 1997
PubMed
Summary
This summary is machine-generated.

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Elevated alpha-fetoprotein (AFP) levels in amniotic fluid (AF) indicate potential fetal abnormalities. Higher AFP levels and positive acetylcholinesterase (AChE) tests significantly increase the risk of NTDs and other congenital conditions.

Area of Science:

  • Prenatal diagnostics
  • Biochemistry
  • Genetics

Background:

  • Maternal serum screening for fetal abnormalities relies on biochemical markers.
  • Alpha-fetoprotein (AFP) in amniotic fluid (AF) is a key indicator for neural tube defects (NTDs) and other congenital anomalies.
  • Interpreting AFP levels requires consideration of other diagnostic tests like acetylcholinesterase (AChE).

Purpose of the Study:

  • To analyze the correlation between elevated amniotic fluid alpha-fetoprotein (AF-AFP) levels and fetal abnormalities.
  • To assess the diagnostic value of AF-AFP in conjunction with acetylcholinesterase (AChE) testing.
  • To refine risk assessment for fetal abnormalities based on AF-AFP levels and AChE results.

Main Methods:

  • Assay of AFP in 48,412 amniotic fluid samples between 1993 and 1995.

Related Experiment Videos

  • Categorization of elevated AF-AFP levels into mild (2.0-4.9 MOM), moderate (5.0-9.9 MOM), and very elevated (>= 10.0 MOM).
  • Correlation of AF-AFP levels and AChE test results with confirmed fetal abnormalities, including NTDs and congenital nephrosis.

    • Main Results:

    • Abnormalities were detected in 25% of mildly elevated, 88% of moderately elevated, and 98% of very elevated AF-AFP cases.
    • Neural tube defects (NTDs) were associated with moderate (45%) and very elevated (36%) AF-AFP levels.
    • Positive AChE tests showed high abnormality rates (>95%) in moderate and very elevated AF-AFP groups; negative AChE tests still indicated significant risks (18-55%) in these groups, particularly for congenital nephrosis.

    Conclusions:

    • Elevated AF-AFP levels, especially above 5.0 MOM, are strongly associated with fetal abnormalities.
    • The combination of AF-AFP and AChE testing improves diagnostic accuracy for fetal anomalies.
    • High-resolution ultrasound and repeat amniocentesis are recommended for cases with elevated AF-AFP and normal initial findings.