There are many more restrictions then you would realize. Process starts at the desk where you sign in, they give you a bunch of information to read including countries you can't have visited and that nature. Then you have a 1 on 1 interview with someone who will go over a questionaire, check your iron level via finger prick, then blood pressure/pulse and weight(they don't actually weigh you). Anything on those checks can DQ you, questionaire is like 40 or so questions. As long as you are healthy, don't do drugs, not gay or have not had gay sex recently you should be ok. I gave last week, I hate needles but what the hell... I ain't doin anything good with my blood, might as well give it to someone else.