This is the jw-media.org official explanation of why Witnesses refuse blood transfusions. It strikes me as being a little weak in its explanation. And very brief.
''Our View of Medical Care
Blood Transfusions
Why don't you accept blood transfusions?
We follow the Bible command, found at Acts 15:20, Acts 21:25, and elsewhere, that Christians must "abstain from . . . blood." Jehovah's Witnesses request the use of nonblood medical alternatives, which are widely accepted and used by the medical community.
Alternatives to blood transfusions
Jehovah's Witnesses request nonblood alternatives, which are widely used and accepted by the medical community. We do this because of the Bible's command to "keep abstaining from . . . blood." (Acts 15:29; see also Genesis 9:3, 4; Leviticus 7:26, 27; 17:1, 2, 10-12; Deuteronomy 12:23-25.) While we refuse blood for religious rather than medical reasons, many have acknowledged that this refusal has helped the Witnesses to avoid contracting many costly and fatal diseases such as AIDS and hepatitis.
Since the Bible makes no clear statement about the use of minor blood fractions or the immediate reinfusion of a patient's own blood during surgery, a medical process known as blood salvaging, the use of such treatments is a matter of personal choice.''
So, why don't you accept blood transfusions? Christians must 'abstain from.....blood'. That's it. Is that perhaps up for interpretation? Nope, that's it.
Since the Bible makes no clear statement about the use of the four main blood components, um oops sorry. Got carried away.
This is the main world wide web international awareness site for the dissemination of information to the world's media of why all 7 million JW's believe that transfusing blood is wrong.
It is pathetic.