A 69-year-old patient in the geriatric clinic has an annual physical examination and a complete blood count and serum electrolytes are drawn. While the physical examination was uneventful, the laboratory results show an elevated blood urea nitrogen (BUN). The nurse will then:

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BUN can be elevated as a result of certain medication therapies and so the nurse should assess for this possibility. An elevated BUN is not diagnostic of renal failure alone and will not necessarily be reflected in physical symptoms. A 24-hour urine sample will not generally be done to determine BUN levels. An elevated BUN is not expected as a normal part of aging. Renal functioning decreases substantially with aging, but in most cases the body is able to compensate adequately with only slight increases in laboratory findings.

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