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,
