A nurse is collecting data from a client who has acute gastroenteritis. Which of the following data collection findings should the nurse identify as the priority?

A. Potassium 2.5 mEq/L: This is severe hypokalemia (normal ~3.5–5.0 mEq/L) and is life-threatening because it can cause cardiac arrhythmias and muscle weakness; it takes priority over the other findings. B. Urine specific gravity 1.035: Abnormally high, indicating significant dehydration/concentrated urine, important but less immediately life-threatening than severe hypokalemia. C. Blood glucose 150 mg/dL: Mildly elevated but not emergent in most adults; not the priority in gastroenteritis unless the patient is diabetic and symptomatic. D. Weight loss of 3% of total body weight: This indicates fluid loss and is clinically important, but less immediately dangerous than a K⁺ of 2.5 mEq/L.