A nurse is reviewing the laboratory values of a client who has chronic glomerulonephritis. Which of the following is an expected finding for this client?

A. BUN 100 mg/dL: In chronic glomerulonephritis, progressive kidney damage leads to impaired excretion of nitrogenous wastes, causing elevated blood urea nitrogen (BUN) levels. A BUN of 100 mg/dL reflects significant renal dysfunction, which occurs in advanced disease. B. RBC 4.9 mm3: A normal red blood cell count would typically range from 4.2 to 5.4 million/mm³ in adults. Clients with chronic kidney disease often develop anemia due to decreased erythropoietin production, so a normal RBC is not an expected finding. C. Serum potassium 4.0 mEq/L: Clients with chronic glomerulonephritis are at risk for hyperkalemia due to impaired potassium excretion. Therefore, a normal potassium level does not reflect the typical laboratory pattern in advanced disease. D. Serum creatinine 0.8 mg/dL: Normal serum creatinine is approximately 0.6–1.2 mg/dL. In chronic glomerulonephritis, creatinine usually increases as renal function declines. A value of 0.8 mg/dL does not indicate impaired kidney function and is not an expected finding.