An adult male has a serum BUN of 56 mg/dL and a creatinine of 0.8 mg/dL.These results are consistent with:

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This patient has an elevated BUN and normal creatinine.The BUN-to-creatinine ratio is greater than 20.Because the creatinine is normal,this is a case of prerenal azotemia.Prerenal azotemia is due to poor perfusion of the kidneys or an increased rate of protein breakdown.Postrenal azotemia is also indicated by an elevated BUN to creatinine ratio; however,creatinine is increased in this case.In renal disease,elevations in both BUN and creatinine characteristically result in a ratio between 12 and 20.A ratio of less than 12 is present in acute tubular necrosis.The GFR is used to assess renal function and is most frequently predicted using the serum creatinine.A decreased GFR is an indicator of renal insufficiency.

An Adult Male Has a Serum BUN of 56 Mg/dL