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Amniotic fluid C-peptide as an index for intrauterine fetal growth
Insights
Fetal insulin production, indicated by amniotic fluid C-peptide (AFCP), differs between small (SGA) and large (LGA) infants. Lower AFCP suggests less insulin in SGA fetuses, while higher AFCP indicates more insulin in LGA fetuses, impacting growth.
Area of Science:
- Endocrinology
- Perinatal Medicine
- Neonatology
Background:
- Fetal insulin secretion is crucial for intrauterine growth.
- Amniotic fluid C-peptide (AFCP) serves as a marker for fetal insulin production.
- Intrauterine growth restriction and macrosomia are associated with altered fetal development.
Purpose of the Study:
- To investigate the relationship between amniotic fluid C-peptide (AFCP) levels and fetal growth parameters.
- To assess whether AFCP can predict intrauterine growth patterns in non-diabetic pregnancies.
- To correlate AFCP with infant classification by birth weight and gestational age.
Main Methods:
- Measurement of amniotic fluid and cord blood C-peptide, insulin, and glucose in 103 non-diabetic infants (≥36 weeks gestation).
- Classification of infants into small for gestational age (SGA), average for gestational age (AGA), and large for gestational age (LGA) groups.
- Statistical analysis to determine correlations between AFCP levels and infant growth percentiles.
Main Results:
- AFCP levels showed a significant correlation with infant weight-gestational age percentile.
- SGA infants exhibited lower AFCP levels, indicating reduced fetal insulin production.
- LGA infants demonstrated higher AFCP levels, suggesting increased fetal insulin production.
Conclusions:
- Persistent low insulin production by SGA fetuses may contribute to their restricted growth.
- High insulin production by LGA fetuses may lead to excessive intrauterine growth.
- AFCP is a valuable indicator of fetal insulin secretion and its impact on intrauterine growth.
Abstract:
Amniotic fluid C-peptide (AFCP) was monitored as an indicator of the amount of insulin secreted by the fetus in utero. Levels of amniotic fluid and cord blood C-peptide, insulin, and glucose were measured in 103 nondiabetic infants at greater than or equal to 36 weeks's gestation. Infants were grouped according to birth weight and gestational age at delivery, as follows: small gestational age (SGA, less than or equal to 10%, n = 11), average for gestational age (AGA, 10% to 90%, n = 75), large for gestational age (LGA, greater than 90%, n = 17). AFCP correlated best with infant weight-gestational age percentile classification: low AFCP in SGA infants and high AFCP in LGA infants. The data from this study suggest that a persistently low production of insulin by SGA fetuses and a high production of insulin by LGA fetuses may lead to the different intrauterine growth rates observed.