A nurse is assessing a client in the oliguric phase of acute kidney injury. Which of the following findings should the nurse expect?

A. Increased GFR is not expected; GFR is decreased in the oliguric phase due to impaired kidney function. B. Hypomagnesemia is not typical; magnesium levels tend to increase because of reduced renal excretion. C. Hyperkalemia is a common finding during the oliguric phase due to reduced potassium excretion. D. Decreased creatinine level is not expected; creatinine levels rise due to accumulation of waste products.