The nurse is completing the admission assessment of an adolescent client who is underweight and admitted to a psychiatric unit with a diagnosis of depression. Which finding requires notification to the healthcare provider? Reference Range: Potassium (K+) [3.5 to 5.0 mEq/L or 3.5 to 5.0 mmol/L] White Blood Cell (WBC) [5000 to 10,000/mm3 or 5 to 10 x 109/L]

A) A body mass index (BMI) of 21 falls within the normal range. B) A blood pressure of 110/70 mm Hg falls within the normal range for adolescents. C) A potassium level of 2.9 mEq/dl (2.9 mmol/L) is below the reference range (hypokalemia) and requires notification to the healthcare provider due to potential cardiac and metabolic complications. D) A WBC count of 10,000/mm3 (10 x 109/L) falls within the normal range.