Modern Jews have a simpler solution, they use common sense :
Dorff, Conservative Judaism’s leading expert on medical ethics and chairman of the Rabbinical Assembly’s Committee on Jewish Law and Standards (CJLS), says that under halachah, or Jewish law, the case would be open-and-shut.
First, halachah does not consider a blood transfusion to be at all akin to the forbidden act of eating blood. Secondly, even eating blood would be permitted under Jewish law to save a life.
http://jstandard.com/content/item/how_judaism_differs_in_life-death_issues/22840