[Maternal serum AFP screening in type I diabetic patients]

Area of Science:

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

Context:

• Insulin-dependent diabetes mellitus (IDDM) in pregnancy presents unique challenges for fetal well-being.
• Maternal serum alpha-fetoprotein (AFP) screening is a standard diagnostic tool in prenatal care.
• Understanding AFP behavior in IDDM pregnancies is crucial for accurate prenatal diagnosis.

Purpose:

• To investigate the correlation between maternal serum AFP levels and pregnancy outcomes in patients with IDDM.
• To assess the utility of AFP screening for detecting open neural tube defects (NTD) and fetal trisomies in IDDM pregnancies.
• To explore potential links between AFP levels, glycemic control (HbA1), and fetal complications like macrosomia and diabetic fetopathy.

Summary:

• This study analyzed maternal serum AFP levels in IDDM pregnancies between 14-20 weeks gestation using radioimmunoassay.
• High AFP levels were observed in two cases, attributed to abortion and gemini, not NTD.
• No significant correlation was found between AFP levels and glycosylated hemoglobin (HbA1), fetal macrosomia, or diabetic fetopathy.
• A notable proportion of low AFP levels were not associated with fetal chromosomal anomalies, suggesting potential for broader screening.

Impact:

• The findings suggest that standard AFP screening thresholds may require re-evaluation in IDDM pregnancies.
• Low AFP levels in IDDM pregnancies, even without confirmed chromosomal anomalies, warrant further investigation for fetal trisomies.
• This research highlights the need for enhanced screening protocols to improve detection rates of fetal aneuploidies in diabetic pregnancies.