A nurse is reviewing the laboratory results of a school-age child who has glomerulonephritis. Which of the following laboratory findings should the nurse expect?

A. Mild hematuria: In glomerulonephritis, hematuria is typically significant, often producing cola- or tea-colored urine. Mild hematuria alone would not reflect the degree of renal involvement usually seen with this condition. B. Absent urine protein: Proteinuria is a common finding in glomerulonephritis due to increased permeability of the glomerular membrane. Absence of protein in the urine would not be expected. C. Decreased blood potassium: Potassium levels usually remain normal or may increase if renal function becomes impaired. Hypokalemia is not a common laboratory finding in glomerulonephritis. D. Hyponatremia: Children with glomerulonephritis often experience fluid retention and dilutional hyponatremia. The kidneys’ impaired ability to filter and excrete fluid contributes to low serum sodium levels.