A nurse is caring for a patient with impaired renal function. A creatinine clearance measurement has been ordered. The nurse is aware that the specimens needed for the calculation of the patient's creatinine clearance will include what?
A) A fasting serum potassium level and a random urine sample
B) A 24-hour urine specimen collection and a serum creatinine level midway through the urine collection process
C) A blood, urea, nitrogen level, and serum creatinine level on three consecutive mornings
D) A sterile urine specimen and an electrolyte panel, including sodium, potassium, calcium, and phosphorus values
Ans: B
Feedback: To calculate creatinine clearance, a 24-hour urine specimen is collected. Midway through the collection, the serum creatinine level is measured. The following formula is then used to calculate the creatinine clearance:
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