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Maternal serum alpha-fetoprotein in normal pregnancy.
British Journal of Obstetrics and Gynaecology
|July 1, 1976
Summary
Serial measurements of alpha-fetoprotein (AFP) in normal pregnancies reveal a distinct gestational pattern. Peak AFP levels correlate with birth weight, fetal sex, and predict the timing of labor onset.
Area of Science:
- Obstetrics and Gynecology
- Biochemistry
- Maternal-Fetal Medicine
Background:
- Alpha-fetoprotein (AFP) is a biomarker with established roles in prenatal diagnostics.
- Understanding the normal gestational profile of AFP is crucial for accurate interpretation.
Purpose of the Study:
- To define the normal gestational pattern of serum alpha-fetoprotein (AFP) levels throughout pregnancy.
- To investigate the correlation between AFP levels and clinical characteristics, including birth weight, fetal sex, and labor onset.
Main Methods:
- Serial radioimmunoassay measurements of AFP were performed in 63 normal pregnancies.
- Gestational age-specific normal ranges for AFP were established.
- Clinical data, including birth weight, fetal sex, and labor onset, were collected and analyzed against AFP levels.
Main Results:
- Significant AFP levels were detectable from 10 weeks gestation, rising until 32 weeks, then declining towards term.
- Higher birth weights correlated with later attainment of peak AFP levels.
- Peak AFP levels occurred earlier in female fetuses.
- Elevated AFP and lower estriol/AFP ratios were associated with earlier labor onset.
Conclusions:
- A well-defined normal gestational pattern for AFP was established.
- AFP levels demonstrate significant correlations with key pregnancy outcomes and clinical parameters.
- These findings enhance the clinical utility of AFP in monitoring normal pregnancy progression and predicting labor timing.