This is what a professor of surgery at the University of Kentucky in Lexington asked about bloodless medical techniques used on Jehovah's Witnesses.
http://www.smh.com.au/world/jehovahs-witnesses-recover-best-from-surgery-despite-refusing-blood-20120703-21fi1.html
Why don't they do it for everyone? Perhaps they will move that way, if it works better. There is no argument here for refusing transfusions though, there are obviously many cases where you will die without a transfusion, and cases where these blood-conservation techniques are just not going to work. Particularly emergency situations.
Emergency situations do call for immediate treatment. We have found through personal experience that blood can be avoided even in emergency situations by the use of volume expanders such as dextrin or saline solutions. It is no accident that blood is compatible with common sea water. By pumping up the volume you prevent the veins from collapsing and allow the body to make up its red oxygen carrying cells, which it does very rapidly. Use of EPO is also helpful in speeding up the body's natural production of red cells.
People naturally assume that blood is life saving, but more people die after blood transfusions than the ones who reject them. The body is magnificently designed and given assistance to heal itself naturally, it will do so very quickly. This is what the medical profession has come to realize.
I don't think it is terribly surprising that patients would do better if they can preserve their own blood rather than rely on transfusions, but transfusions are clearly a vital and life-saving measure in many circumstances.
People opting for future surgery can have their own blood stored if they wish. It is certainly safer than using an unknown person's blood, particularly if it is sold. Do you know the lifestyle of people who need to sell their blood? How healthy are they?
Viruses and bacteria can be transmitted by blood products. They cannot screen for every known virus. The AIDS epidemic of the 80's was largely spread by contaminated blood and blood products such as Factor 8 for haemophiliacs.
The use of blood is of course a personal decision, but for JW's it is not negotiable. We will not have blood put into our bodies by any means or for any reason, and our record stands as one to imitate. Informed doctors will not opt for the use of blood, knowing that recovery is better and with less complications, without it.