<prompt> True about pre-renal azotemiaMuddy brown granular castsUrine creatinine plasma creatinine 20FeNa 1Urine osmolality 500 mOsmkg  <response>: In pre-renal azotemiaBUNcreatinine ratio above 20, FeNa1, hyaline casts in urine sediment,urine specific gravity 1.018, urine osmolality 500 mOsmkgPigmented muddy brown granular casts and tubular epithelial cell casts are seen in acute tubular necrosis.Ref: Harrisons 19e pg: 1805 