http://labtestsonline.org/understand...idtips/start/1
This article has some good advice to prepping kids for blood tests.
http://kidshealth.org/kid/feel_bette...RelatedArticle
This is a good video and maybe since your kids like science and learning.....maybe it would be helpful to see this before hand. Maybe too he would want to learn about blood and all the different kinds (or at least a few of things) that can be learned from testing blood?
And yes I would definitely bribe him. Medical procedures in my family earn people presents. :)

