[Insulin concentration in amniotic fluid in mid-term pregnancy]

Area of Science:

• Reproductive endocrinology and maternal-fetal medicine.
• Biochemical markers in pregnancy.

Context:

• Genetic amniocentesis is performed for advanced maternal age or high-risk genetic history.
• Established screening for gestational diabetes typically occurs later in pregnancy.

Purpose:

• To assess amniotic fluid insulin levels in early pregnancy (16-18 weeks).
• To explore the potential of early amniotic fluid insulin measurement for gestational diabetes detection.
• To investigate correlations between amniotic fluid insulin and newborn birthweights.

Summary:

• Insulin concentrations were measured in 284 amniotic fluid samples from pregnancies at 16-18 weeks.
• Amniotic fluid insulin levels exceeding mean +2 SD (9.8 microIU/ml) were observed in 4.3% of cases, suggesting potential gestational diabetes.
• A significant correlation was found between amniotic fluid insulin and birthweights of female newborns, but not male newborns.

Impact:

• Suggests a potential for earlier gestational diabetes screening via amniotic fluid insulin levels during genetic amniocentesis.
• Highlights a possible sex-specific association between amniotic fluid insulin and fetal growth.
• Recommends targeted screening for gestational diabetes in mothers carrying female fetuses.