Elevated maternal serum alpha-fetoprotein concentration and fetal chromosomal abnormalities

Area of Science:

• Prenatal Diagnosis
• Medical Genetics
• Obstetrics

Background:

• Elevated maternal serum alpha-fetoprotein (MSAFP) is a screening marker for potential fetal anomalies.
• Amniocentesis is a diagnostic procedure used to analyze fetal health.
• Understanding the correlation between amniotic fluid AFP levels and chromosomal abnormalities is crucial for accurate prenatal assessment.

Purpose of the Study:

• To evaluate the diagnostic utility of amniotic fluid alpha-fetoprotein (AFP) levels in identifying fetal chromosomal abnormalities in patients with elevated MSAFP.
• To determine the sensitivity and specificity of elevated amniotic fluid AFP in screening for fetal chromosomal abnormalities.

Main Methods:

• Amniocentesis was performed on 1038 patients with elevated MSAFP.
• Patients were stratified into two groups: normal amniotic fluid AFP and elevated amniotic fluid AFP.
• Fetal chromosomal analysis was conducted, and results were correlated with amniotic fluid AFP levels.

Main Results:

• Eight major fetal chromosomal abnormalities were identified.
• Five abnormalities were associated with elevated amniotic fluid AFP, and three with normal levels.
• Elevated amniotic fluid AFP demonstrated a sensitivity of 62.5% and specificity of 93.3% for detecting fetal chromosomal abnormalities.

Conclusions:

• Elevated amniotic fluid AFP is a significant indicator of fetal chromosomal abnormalities.
• In cases of elevated MSAFP with normal amniotic fluid AFP, the likelihood of a major fetal chromosomal abnormality is very low.
• Amniotic fluid AFP levels provide valuable information in the prenatal diagnosis of fetal chromosomal conditions.