Over time the amount of the medication in the bloodstream would build up. A test potentially could be done to check this. However Seroquel unlike lithium and some other medications is not judged specifically by blood tests to note the blood level but you could ask your psychiatrist more about this. What they tend to go by (I took this medication years ago for an extended period of time) is how a person is responding to the medication but you could ask your psychiatrist more about this as well including how much time it would take to build up to an appropriate dosage level for you to respond to it.
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