Acts 15:19,20 (KJV) Wherefore my sentence is, that we trouble not them, which from among the Gentiles are turned to God: 20 But that we write unto them, that they abstain from pollutions of idols, and from fornication, and from things strangled, and from blood.
This applied to non-Jews (according to the verse) who may not have abstained from blood before this decree. How did early Christians apply this? According to WT commentary, early christians didn’t consume blood or use it for medical purpose.
( I don’t see how a christian bleeding profusely and facing immediate death short of a miracle can get around this. )