True about pre renal azotemia -
Prerenal azotemia Oliguria (urine volume < 500 mL/day) or anuria (< 100 mL/day), high urine specific gravity (>1.015), normal urinary sediment, and low urinary sodium (< 20 mEq/L; fractional excretion of sodium < 1%) are seen Ref Harrison20th edition pg 298
Urine output < 500 ml
Urinary cr. / Plasma cr. > 40
FeNa< 1
FeNa> 1
Kidney