Lithium

This test measures lithium levels in urine to assess medication compliance and kidney function in patients taking lithium for bipolar disorder or severe depression. Lithium is a mood-stabilizing medication with a narrow therapeutic window—too low and it's ineffective, too high and it's toxic. Urine lithium monitoring helps ensure adequate dosing while avoiding toxicity. Chronic lithium use can affect kidney function, so periodic urine and blood testing is important. Your healthcare provider uses these results to optimize your dose and monitor for side effects.