Which differentiating prerenal azotemia with ATN features oring pre-renal azotemia –
Correct Answer: Urine osmolality > 500 mosmol/kg
Description: The normal kidney can elaborate urine with a maximum concentration greater than 1,200 mOsm/kg in states of dehydration. A urinary osmolality (Uosm) greater than 500 mOsm/kg,, is highly suggestive of prerenal azotemia Ref Harrison20th edition pg ,299
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