Results of a patient's 24-hour urine sample indicate osmolality of 510 mOsm/kg, which is within reference range. What conclusion can the nurse draw from this assessment finding?
A) The patient's kidneys are capable of maintaining acid–base balance.
B) The patient's kidneys reabsorb most of the potassium that the patient ingests.
C) The patient's kidneys can produce sufficiently concentrated urine.
D) The patient's kidneys are producing sufficient erythropoietin.
Ans: C
Feedback:
Osmolality is the most accurate measurement of the kidney's ability to dilute and concentrate urine. Osmolality is not a direct indicator of renal function as it relates to erythropoietin synthesis or maintenance of acid–base balance. It does not indicate the maintenance of healthy levels of potassium, the vast majority of which is excreted.
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