A nurse is caring for a client with respiratory insufficiency. The ABG results indicate a pH of 7.50 and a PCO2 of 30 mm Hg, and the nurse is told that the client is experiencing respiratory alkalosis. Which of the following additional laboratory values would the nurse expect to note?
1. A sodium level of 145 mEq/L
2. A potassium level of 3.2 mEq/L
3. A magnesium level of 2.4 mg/dL
4. A phosphorus level of 4.0 mg/dL