When caring for a client with an acid-base imbalance, which serum electrolytes are essential for a nurse to monitor? (Select 2 that apply)

Rationale: A. Magnesium plays a role in acid-base balance and influences potassium levels. B. Sodium is important but less directly related to acid-base balance than potassium and magnesium. C. Potassium is critical to monitor because acid-base imbalances often cause shifts in potassium levels, affecting cardiac function. D. Calcium levels can be affected but are less immediately critical than potassium and magnesium. E. Phosphate is involved in metabolism but is not a primary electrolyte monitored for acid-base balance.