Prior to administering an oral dose of methylprednisolone, the nurse determines the client's serum total calcium level is 5.5 mg/dL (1.375 mmol/L). What action is most important for the nurse to take?

A. Administering the medication with milk will not address the critical issue of the severely low calcium level. B. Tapering the medication dose is not immediately relevant to the calcium level issue and should be based on the overall treatment plan and the healthcare provider’s guidance. C. A serum calcium level of 5.5 mg/dL is significantly below the normal range and requires prompt medical evaluation. Notifying the healthcare provider is crucial for addressing the potential causes and necessary interventions. D. Teaching about calcium-rich foods is important for long-term management but does not address the immediate concern of the critically low calcium level that needs urgent attention.