Hi Caleb:
Here I want to quote to you how the ancient jewish concept of holiness is reconfigured by the Watchtower Society:
Surely we do not want to sadden Jehovah’s heart by accepting something that his Word condemns! Many medical professionals and other advocates of blood transfusion appeal to people to donate blood in hopes of saving lives. However, Jehovah’s holy people acknowledge that the Creator has the right to say how blood is to be treated. To him, “any sort of blood” is sacred. We must be determined to obey his law on blood. By our holy conduct, we prove to him that we deeply appreciate the lifesaving power of Jesus’ blood —the only blood that makes possible the forgiveness of sin and everlasting life.—John 3:16. (The Watchtower, Study Edition, 11/15, 2014) (here the link of the article : http://wol.jw.org/en/wol/d/r1/lp-e/2014843 )