A nurse is caring for an elderly patient on multiple medications. The nurse suspects that age-related toxicity may have developed. Which laboratory/diagnostic test would provide the best indication of renal function?
a. Creatinine clearance
b. Renal biopsy
c. Urinalysis
d. Blood urea nitrogen
A
The proper index of renal function in the elderly is creatinine clearance.
A renal biopsy would not be indicated as an index of renal function without other initial labora-tory/diagnostic testing.
A urinalysis analyzes urine, not renal function.
Blood urea nitrogen can evaluate renal function; however, it also can be altered by other factors, such as hydration status; therefore, it is not the best indicator of renal function.
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