Biblically, "Blood" represents DEATH, not life. The presence of blood showed that the previous owner had died. People are saved by Jesus' blood -- his death. The life was in the blood, therefore its presence indicates that life had been extinguished. The blood in a medical procedure does not indicate the previous owner is dead. It is a gift of life.
https://jwstudies.com/The_Meaning_of__Blood_.pdf
https://jwstudies.com/Blood_is_a_religious_issue.pdf
The WTS is inconsistent, in that it arbitrarily permits the use of products made from blood.
They used to decry vaccination, since it often requires the use of blood.
https://jwstudies.com/1931_02_04_Golden_Age__Pattillo_on_vaccinations__blood.pdf
Here is communication with the GB
https://jwstudies.com/The_Jensen_letters_analysis_and_commentary.pdf
Significantly, its booklet "Jehovah's Witnesses and the Question of Blood" consistently misquotes and misrepresents sources.
https://jwstudies.com/Handling_Medical_Evidence.pdf
The following is a Guide I prepared that was intended to be a Guide for those developing policies within the medical industry:
https://jwstudies.com/Loyalty_Test.pdf
Doug