Yeah I guess you're right OC. I just fell back on my old thinking which was the doctors would be more careful if they couldn't use blood. But, you're right it is unfair to assume that just because a doctor can use blood that they would play fast and loose with your life.
However, I would be willing to also agree that in specific circumstances with specific doctors that this could be true.
I did decide in my case to never mention the JW thing since I don't want my doctor worrying about anything other than my health and not what he/she can or cannot do.