A patient with an elevated blood urea nitrogen (BUN) and serum creatinine is scheduled for a renal arteriogram. The nurse should question an order from radiology for bowel preparation with the use of

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High-phosphate enemas, such as Fleet enemas, should be avoided in patients with elevated BUN and creatinine because phosphate cannot be excreted by patients with renal failure. The other medications for bowel evacuation are more appropriate.

A Patient with an Elevated Blood Urea Nitrogen (BUN) and Serum