AKIN Staging for Acute Kidney Injury

Stages acute kidney injury severity 1–3 from the Acute Kidney Injury Network serum-creatinine and urine-output criteria assessed over a 48-hour window, to grade injury and guide management.

Serum creatinine unit (governs both baseline and current values)

Baseline (reference) serum creatinine

Current (peak) serum creatinine

Urine output category (worst sustained over the 48-h window)

Receiving / requiring renal replacement therapy (RRT)