The Adult Client Has Had Serum Electrolyte Levels Drawn

The adult client has had serum electrolyte levels drawn. The nurse receiving the results by telephone from the laboratory would be most concerned with which of the following results?

A) Sodium level, 142 mEq/L
B) Chloride level, 103 mEq/L
C) Potassium level, 5.4 mEq/L
D) Bicarbonate level, 24 mEq/L