When assessing a client with an ionized calcium level of 17 mg/dL (4.25 mmol/L), which intervention is most important for the nurse to implement? Reference Range lonized Calcium [Adult 4.6 to 5.1 mg/dL (1.15 to 1.35 mmol/L)]

A. An ionized calcium level significantly above the reference range can lead to cardiac dysrhythmias and requires immediate attention to assess cardiac function. B. While urine output and characteristics are important indicators of renal function, cardiac assessment takes priority due to the potential cardiac effects of hypercalcemia. C. Assessment of deep tendon reflexes is relevant since hypercalcemia can lead to muscle weakness and diminished reflexes. However, this should be done after assessing for any cardiac dysrhythmias. D. Comparing muscle strength bilaterally is important for assessing neurological integrity but is not the priority when hypercalcemia is suspected.