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: Glomerulonephritis commonly causes inflammation of the glomeruli, leading to leakage of red blood cells into the urine. This results in mild hematuria, which is a typical laboratory finding in this condition. The presence of blood in the urine reflects glomerular damage. B. Absent urine protein: Proteinuria is usually present in glomerulonephritis due to increased glomerular permeability. The absence of urine protein would be unusual and inconsistent with this diagnosis, as protein leakage often occurs alongside hematuria. C. Hyponatremia: Although hyponatremia can sometimes occur in glomerulonephritis due to fluid retention and dilution, it is not a primary or consistent laboratory finding. Sodium levels may remain normal or fluctuate depending on the severity of the condition and fluid status. D. Decreased blood potassium: Potassium levels are typically not decreased in glomerulonephritis. In fact, some cases may show normal or elevated potassium levels due to impaired kidney function and reduced excretion, making decreased potassium an unlikely finding.