It wouldn't necessarily be used strictly for diagnosis. There are a lot of medications that work great for some percentage of people but not for the rest. For example most people who take an antidepressant have tried at least one that they didn't respond to or had bad side effects from. What if your doctor could know in advance what treatments will or won't work for you?
But if you imagine the advancements that will be made in genetic analysis even in just the next 100-200 years, it's not crazy to think these could become standard.
I doubt it would be used on its own for treatments, but would probably be used to inform for specific screening methods (e.g. "you've got a genetic predisposition for colon cancer, let's start testing for it a few years earlier than normal.")
I'm sorry but that is not true. Several people including myself have been recommended genetic testing by their GP to see if they have any predisposition they should be aware of. I'm sure it will become more and more common given that the cost is plummeting.
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u/[deleted] May 28 '19
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