No significant correlations were found between gestational age and any biomarker, including sTFF3, NGAL/creatinine, uTFF3/creatinine, uKIM-1/creatinine, and cystatin C (for AKI group, respectively: ρ = 0.013, p = 0.957; ρ = 0.098, p = 0.690; ρ = 0.061, p = 0.804; ρ = 0.083, p = 0.735; ρ = –0.425, p = 0.070). This evidence concerns the gene CST3 and acute kidney injury.