[foobiekr]

I want to know so that I can make plans. Including end of life plans, in all senses.

[iamflimflam1]

Exactly - there are things that I would change now to make sure I make thing easier for myself and - more importantly - easier for the people around me.

[fletchowns]

Those plans should be in place regardless of the results of a blood test

[idiotsecant]

Yes, like walking out into the woods before it gets too bad.

[TaupeRanger]

Like what? You should already have a will, life insurance, etc. even without the disease. All you're doing by knowing earlier is causing psychological harms to yourself and the people you tell, adding more years of anxiety, grief, and sadness for no gain. Think about the bigger picture.