My son (who is not a teenager yet) is currently in an inpatient psych unit. The psychiatrist is thinking it might be a good idea to test him to see if he has the HD gene. I agree especially due to medication issues. But I also feel how will this impact his life if it's positive. It probably doesn't make sense to get long-term care insurance for a young kid, does it? Anything other thoughts or advice anyone has would be appreciated.

Please bear in mind my cynical nature when reading my opinion

The treatment of the symptoms would be similar whether the reason is HD or other.
If there is a possibility of HD, then, if there is any difference (and I doubt there is) the medication to treat the HD generated symptoms should be first tried.

I would be concern that if a diagnosis of HD is made, that gives Dr. the excuse not to diligently try to treat the symptoms.