For the last 10 years I was in, I didn't agree with the blood doctrine, hence, I would have taken blood -> if I had indeed been conscious! The reason for this is that, for several years, I was still carrying my no-blood card.
Every once in a while some brother would basically inquire about that card and I would be able to show it. At that time, I considered that carrying it implied accepting a risk that would be significantly less than doing extreme sports, unprotected sex, using drugs or cigarettes.
Than, I started "loosing" that card all the time.
Still, I thought it be interesting to share that at one time, I was carrying the card, fully aware that the rule was illogical and non-scriptural.