Interesting that the Hebrew word used for “life” in that passage, transliterated as “nephesh”, is also translated as “soul” in other passages...as in God breathed into Adam’s nostrils the breath of life, and he became a “living soul”.  I’m no JW, but after doing a study on this very subject using a Strong’s concordance, I think I would have to be in very grave danger to accept a blood transfusion.