<prompt> True about pre renal azotemia -Urine output 500 mlUrinary cr. Plasma cr. 40FeNa 1FeNa 1  <response>: Prerenal azotemia Oliguria urine volume 500 mLday or anuria 100 mLday, high urine specific gravity 1.015, normal urinary sediment, and low urinary sodium 20 mEqL; fractional excretion of sodium 1 are seen Ref Harrison20th edition pg 298 