The following parameters/characteristics were comparably distributed between AKIN stages 1 and 3: gender, age, duration of stay at the hospital (DOS), AKI onset (outpatient versus in-hospital), initial CRP, preexisting arterial hypertension, coronary artery disease, chronic heart failure, diabetes mellitus, obesity, and neoplasia. Here, CRP is linked to obesity due to melanocortin 4 receptor deficiency.