Medicine All India exam 4936aa7b In acute tubular necrosis, all are true except A Specific gravity of urine < 1.020 B Urine Osmolatlity > 500 C Blood urea: creatinine ratio < 20 D Urine sodium < 20mmol/l High-Yield Explanation Acute tubular necrosis: - Muddy brown granular or tubular epithelial cell casts- FENa > 1%- UNa > 20 mmol/L- SG < 1.015 Ref: Harrison's 17/e p1757 table 273-2