Medicine 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 💡 Explanation In acute tubular necrosis, all are true except ✓ Correct Answer: D. Urine sodium < 20mmol/l