A 69-Year-Old Patient in the Geriatric Clinic Has His Annual

A 69-year-old patient in the geriatric clinic has his annual physical examination,and a complete blood count and serum electrolytes are drawn.His laboratory results show an elevated blood urea nitrogen (BUN) .What is the next action of the nurse?

A) Assume that the laboratory result was a false-positive because the patient did not exhibit any symptoms of renal failure.
B) Look at his medication list because an elevated BUN may be the result of specific medications.
C) Instruct him on collecting a 24-hour urine specimen for protein analysis.
D) Tell him that an elevated BUN is normal in older adults.