Maternal plasma alpha-fetoprotein in normal and complicated pregnancies

Area of Science:

• Obstetrics and Gynecology
• Maternal-Fetal Medicine
• Clinical Chemistry

Background:

• Plasma alpha-fetoprotein (AFP) is a biomarker used in prenatal screening.
• Understanding AFP levels in pregnancy is crucial for assessing fetal health.
• Previous studies have explored AFP's utility in detecting pregnancy complications.

Purpose of the Study:

• To establish reference ranges for maternal plasma AFP in normal pregnancy.
• To evaluate the diagnostic reliability of maternal plasma AFP for predicting fetal well-being.
• To investigate the correlation between maternal plasma AFP levels and pregnancy complications.

Main Methods:

• Radioimmunoassay was used to measure plasma AFP levels.
• Healthy non-pregnant adults and pregnant women (normal and complicated pregnancies) were included.
• A 90% reference range for normal pregnancy was established for comparison.

Main Results:

• A significantly higher proportion of complicated pregnancies showed AFP levels below the 5th centile compared to uncomplicated pregnancies.
• However, approximately 75% of AFP estimations in complicated pregnancies fell within the normal 90% range.
• No significant correlation was found between maternal plasma AFP values and fetal distress, small-for-dates infants, or perinatal mortality.

Conclusions:

• Maternal plasma alpha-fetoprotein measurement is not a reliable standalone test for predicting fetal well-being.
• The overlap in AFP levels between complicated and uncomplicated pregnancies limits its predictive accuracy.
• Further research may be needed to identify more robust biomarkers for fetal health assessment.