A nurse is reviewing urinary laboratory results. Which finding will cause the nurse to follow up?

Choice A reason: Specific gravity of 1.036 is slightly above the normal range (1.005-1.030), suggesting concentrated urine, possibly from dehydration. While it warrants monitoring, it is not immediately alarming compared to proteinuria, which indicates potential renal pathology. Choice B reason: Urine output of 80 mL/hr (1920 mL/day) is within normal adult range (800-2000 mL/day). This does not require immediate follow-up, as it reflects adequate renal perfusion and function under normal conditions. Choice C reason: Protein level of 2 mg/100 mL (20 mg/L) indicates proteinuria, abnormal as normal urine protein is <150 mg/day. This suggests potential glomerular damage, infection, or systemic disease (e.g., diabetes), requiring urgent follow-up to diagnose and manage underlying pathology. Choice D reason: Urine pH of 6.4 is within the normal range (4.5-8.0), reflecting typical dietary and metabolic influences. It does not indicate an abnormality requiring follow-up, as it aligns with expected physiological variation.