A nurse is checking the laboratory tests for a client who has glomerulonephritis. The nurse should expect to find an increase in which of the following test results?

A. RBC: Red blood cell counts may be normal or slightly decreased in glomerulonephritis due to hematuria, but an increase in RBCs is not expected. Hematuria typically reflects RBCs in the urine rather than in the bloodstream. B. BUN: Blood urea nitrogen (BUN) is elevated in glomerulonephritis due to impaired kidney filtration. The inflamed glomeruli cannot adequately remove nitrogenous waste, leading to accumulation in the blood, which is a hallmark laboratory finding in this condition. C. Creatinine clearance: Creatinine clearance usually decreases in glomerulonephritis because kidney function is impaired. A reduction, rather than an increase, indicates a diminished ability of the kidneys to filter creatinine from the blood. D. Specific gravity: Urine specific gravity may vary in glomerulonephritis, often reflecting the kidney’s ability to concentrate urine. While it can be elevated if the urine is concentrated, a consistent increase is not a defining laboratory feature, making BUN a more reliable indicator of renal impairment.