Patient with bipolar d/o was on lithium
• Fasting Precipitate Lithium toxicity
• Typical Clinical features of Lithium toxicity: all these suggest Lithium toxicity.
Next step in workup of this case should be check RBS and send sample for all electrolytes with serum lithium levels. But they are asking test which can help you in making diagnosis of this patient which you will always be Serum Lithium