An adult client who is admitted to the mental health unit for treatment of bipolar disorder has a slightly slurred speech pattern and an unsteady gait. Which assessment finding is most important for the nurse to report to the healthcare provider? Reference Range: Blood alcohol level [0 to 0.05% (0 to 10.9 mmol/L] Lithium [0.8 to 1.2 mEq/L (0.8 to 1.2 mmol/L)]