AIN Score — Acute Interstitial Nephritis Risk Assessment

Identifies patients with acute kidney injury (AKI) who have clinical and laboratory features most consistent with acute interstitial nephritis (AIN) as opposed to other AKI etiologies (pre-renal, ATN, obstruction, glomerulonephritis). AIN accounts for 15–25% of AKI biopsies and is importantly a reversible cause if the offending drug or trigger is removed promptly. The score uses clinical and urinalysis features to support pre-biopsy risk stratification.