I would add a comment from a publication made in my country about JW and blood, which catch my eye (it is a google translate, hope it is understandable):
There is a dilemma all the time. I would not want to be cynical, but maybe what I'm going to say sounds cynical, but not intentionaly. Namely, as a transfuziologist I need to know what is the origin of any blood type. Blood composition and immunoglobulin and albumin and high-purified concentrations of blood-induced coagulation factors. Behind them stands a huge industry, multinational companies; their application earns enormous capital. That's acceptable. Blood, the erythrocyte concentrate, which is synonymous for "full blood", is practically on the verge of profitability. Not to be accepted. Granulocytes, platelets, plasma, which cost nothing, are not accepted. Transplant medicine, everywhere in the world a highly profitable profession, is acceptable. Liver transplantation (colleague X knows, a liters of blood is in one liver when is taken out) is acceptable. Transplantation of peripheral cells (what is the difference from erythrocyte? but there is a lot of money on that) is acceptable. Transfusion, which is not profitable, is not accepted. My big dilemma remains on that.It turns out that, from the point of view of the medical profession, the official attitude of JW to blood is consistent only in one thing?