Compared to patients who did not develop early subclinical kidney injury, those who presented an increase in NGAL levels ≥ 25% 48 h after contrast administration vs. baseline (Table 4) had higher serum creatinine and lower eGFR on admission (both p < 0.01), and higher total protein levels (both on admission [p = 0.04] and at the 48-h follow-up [p = 0.001]), had higher Mehran scores (p = 0.02) and lower sodium levels at the 48 h follow-up (p = 0.02), but there was no significant between-groups difference in the volume of contrast media administered (p = 0.67). The gene discussed is LCN2; the disease is injury.