A client diagnosed with bipolar disorder asks the nurse why it is necessary to have a serum lithium level drawn every 3 to 4 months. The nurse's response should be based on which of the following? 1....

A client diagnosed with bipolar disorder asks the nurse why it is necessary to have a serum lithium level drawn every 3 to 4 months. The nurse's response should be based on which of the following?

1. To monitor compliance with the medication.

2. To prevent toxicity related to the drug's therapeutic range.

3. To monitor the client's white blood cell count.

4. To comply with the drug manufacturer's requirements.