Andrew is a 14-year-old male who is being managed for bipolar I disorder. He was started on lithium 6 weeks ago and has achieved a serum level of 1.1 mEq/L according to his most recent blood work. Andrew says he doesn't feel any different, but both his parents and teachers report improvement in his mood. He has been more stable, is getting along better with friends and siblings, and is even more interested in his schoolwork. The PMHNP plans to maintain Andrew on this medication and knows that he will need which of the following ongoing laboratory assessments?
1) Complete blood count (CBC)
2) Liver function tests (LFTs)
3) Renal function tests (RFTs)
4) Thyroid function tests (TFTs)
