What laboratory value change should indicate to a nurse that a patient with renal failure has entered the oliguric stage?
a. Blood urea nitrogen (BUN) level rises.
b. Serum calcium increases.
c. Blood volume decreases.
d. Urine osmolality increases.
A
In the oliguric stage of renal failure, the urine output decreases to less than 400 mL/day; the BUN, creatinine, and potassium increase; and the serum calcium decreases. The patient becomes hypervolemic as the urine osmolality increases.
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