Measuring BUN and creatinine on a patient prior to surgery is only necessary if the patient has a condition that is associated with kidney disease or if perioperative management would be significantly affected by the presence of renal disease.


Indications for measuring a patient's BUN and creatinine prior to surgery:

(1) history of renal disease

(2) abnormal urine output (anuria, oliguria or unexplained diuresis)

(3) evidence of a urinary tract infection

(4) history of hypertension and/or cardiovascular disease

(5) diabetes mellitus

(6) recent therapy with a drug associated with a nephropathy

(7) therapy with corticosteroids and/or diuretics

(8) history of liver disease

(9) central nervous system disease

(10) age >= 65 years of age

(11) unstable symptoms with no BUN or creatinine results in the past 2 months

(12) abnormal diet, especially one that does not contain protein

(13) morbid obesity

(14) history of abnormal serum creatinine


A patient with none of these findings probably does not need to have the BUN and creatinine measured prior to surgery,


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