The nurse is caring for a client with respiratory insufficiency. The arterial blood gas (ABG) results indicate a pH of 7.50 and a Pco2 of 30 mm Hg (30 mm Hg), and the nurse is told that the client is...

The nurse is caring for a client with respiratory insufficiency. The arterial blood gas (ABG) results indicate a pH of 7.50 and a Pco2 of 30 mm Hg (30 mm Hg), and the nurse is told that the client is experiencing respiratory alkalosis. Which additional laboratory value should the nurse expect to note?

 1. A sodium level of 145 mEq/L (145 mmol/L) 2. A potassium level of 3.0 mEq/L (3.0 mmol/L) 3. A magnesium level of 1.3 mEq/L (0.65 mmol/L) 4. A phosphorus level of 3.0 mg/dL (0.97 mmol/L)