Abstract:Objective To analyze the predictive value of serum thioredoxin-interacting protein (TXNIP) and C-peptide (C-P) levels for fetal growth restriction (FGR) in gestational diabetes mellitus (GDM) patients.Methods Eighty-six GDM patients admitted from January 2021 to January 2024 were enrolled as observation group; ninety-three healthy pregnant women from the same period served as controls. Clinical data were collected, and serum TXNIP/C-P levels were measured. Based on pregnancy outcomes, the observation group was divided into FGR and non-FGR subgroups for TXNIP/C-P level comparison. Multivariate stepwise logistic regression analyzed TXNIP/C-P impact on FGR risk. Receiver operating characteristic (ROC) curves evaluated predictive value.Results FGR subgroup exhibited higher serum TXNIP and C-P levels versus non-FGR subgroup (P < 0.05). Elevated TXNIP [O^R = 1.159 (95% CI: 1.056, 1.273) ] and C-P [O^R = 4.957 (95% CI: 1.633, 15.044) ] were independent FGR risk factors (P < 0.05). Combined TXNIP/C-P detection predicted FGR with sensitivity = 82.1% (95% CI: 0.631, 0.939) and specificity = 81.0% (95% CI: 0.686, 0.901).Conclusion Elevated serum TXNIP and C-P levels correlate with increased FGR risk in GDM patients. Combined detection enhances predictive accuracy.