A 22-Year-Old Female Has Been Taking Lithium (Carbolith)for 6 Months

A 22-year-old female has been taking lithium (Carbolith) for 6 months.She has blood work every month,and the nurse assesses her for signs of toxicity.What are the indications of toxicity?

A) Serum lithium level of 0.8 mmol/L and excitability
B) Serum lithium level of 1.0 mmol/L and palpitations
C) Serum lithium level of 1.3 mmol/L and hypertension
D) Serum lithium level of 2.3 mmol/L and cardiac dysrhythmias