<prompt> Pre-renal azotemia is associated with one of the Mowing characteristic feature -UrinaryNa lOmmolLRenal failure index 1Osmolality 500Urinary creatinineP.creatinine ratio 20  <response>: Ref:Harrison 20th edition pg no 291. Values pre renal Azotemia oliguric phase of renal failure BUNp cr 20:1 10-15:1 Urine sodium meqL 20 40 Urine osmolality mosmolL H20 500 350 Fractional excretion of Na 1 2 Urine analysis casts hyaline or granular muddy brown Urineplasma creatininr 40 20 