Point of information on serium Lithium blood tests : Maintenance studies are subdivided in trials with low (i. e. below 0.6 mEq/l),medium (i. e. 0.6 to 0.8 mEq/l) and high (i. e. above 0.8 mEq/l) lithium serum levels. Percentage of depressive vs. (hypo-)manic or mixed recurrences are compared for these three groups. The percentage of depressive recurrences in the groups with low, medium and high lithium levels differed acording to dosage. The results might indicate that low lithium levels are effective in preventing depression whereas higher blood levels are needed to prevent (hypo-)manic or mixed states.
Your pdoc will need to watch the serium Lithium carefully for your own stability.