Lurking,
I asked - and they will draw blood, give my husband the "sniff test" that I always have to take, and ask for his medical history.
Heaven knows they have enough blood from me (somewhere) so they can compare and look for differences between us. We've been married for 36 years now
and except for a 14-month tour of duty to Korea and various other Army assignments, we've been together, at the same locations.
I am all for doing what I can to add to the knowledge base. And my husband wants to help too. That's a good thing.