To add to many good points made here: Even if we could with perfect accuracy, we wouldn’t gain too much. Mental illness is MUCH more complicated than a simple disbalance of neurotransmitters. It’s a highly complex machinery of thousands of electrochemical processes across billions of neurons. You could measure the exact same composition of neurotransmitters in a suicidal patient and a dude who just won the lottery because there are so so many other factors at play.
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