As a JW I never felt right about having that 'chat' to my doctor and never ever did, it seemed like something a freak would do. So I ignored the suggestion and just talked to the doc about medical things.
I had a blood card in my wallet, but I always hated it being there: it did two things, 1) make me look like a freak to any non-JW who saw it, and 2) protect me from questioning from JW's who might notice its absence if I didn't have one. Oh, yeah, and put my life at risk too. On balance I thought it was better to have one for JWs to see.
But I seem to have a vauge memory, and this may be a wishful one, that as I got closer to leaving that there were a couple of shortcomings in how it was filled out: like undated, or unwitnessed or somthing, and that I was quite content with that. Or maybe it was blank? I can't quite remember. Or maybe each year it just got less complete. I do remember my wife chiding me about it though. And my book study conductor suggesting he have a look at it for some reason one day and that I had to make an excuse: he didn't persue it.
Once Mrs Divergent saw through it all too, we had a little ceremony burning our cards in the backyard. Happy day.