Until recently, there were no studies either supporting or negating blood transfusions -- or at least none that the medical community paid attention to.
Your joking right ?
Yes there has been medical complications involving BT but you totally forgot to mention the millions of lives saved by the use of this medical procedure,
since its inception into the medical field.
Lets be open and honest on the subject.
Yes there are known risks involved but the risks of not using the procedure many times over rules to do,
thats why its important to weigh the risk in a balanced and professional way.