Use of the 50-g glucose challenge test to predict small-for-gestational-age neonates

Area of Science:

• Obstetrics and Gynecology
• Neonatal Medicine
• Endocrinology

Background:

• Gestational diabetes screening commonly uses the 50-g glucose challenge test (GCT).
• Predicting small-for-gestational-age (SGA) neonates is crucial for perinatal care.
• The utility of low 50-g GCT values in predicting SGA requires further investigation.

Purpose of the Study:

• To establish a cutoff value for the 50-g GCT to predict SGA neonates.
• To evaluate the association between low 50-g GCT values and SGA.
• To determine the diagnostic performance of the 50-g GCT for SGA prediction.

Main Methods:

• Retrospective cohort study of pregnant women undergoing 50-g GCT screening.
• Comparison of demographic, clinical, and obstetric outcomes between low 50-g GCT (<10th percentile) and control groups.
• Logistic regression and ROC curve analysis to identify predictors and assess 50-g GCT performance for SGA.

Main Results:

• The low 50-g GCT group (<74 mg/dL) exhibited lower birthweight, percentile, and Apgar scores, with significantly higher SGA rates.
• A 50-g GCT value below the 10th percentile was a significant independent predictor of SGA (OR: 3.29).
• A cutoff value of 89.5 mg/dL demonstrated 84.9% sensitivity and 85.6% specificity for SGA prediction.

Conclusions:

• Low 50-g GCT values (<89.5 mg/dL) may serve as an early indicator for SGA.
• The 50-g GCT cutoff of 89.5 mg/dL shows promising performance in identifying neonates at risk for SGA.
• Further prospective studies are warranted to validate these findings.