That would clearly rule out medical treatments that involve taking in whole blood or any of its four major components.
(‏ غل ٦ :‏ ٥‏ )‏ وَلٰكِنْ بِمَقْدُورِهِمْ أَنْ يَلْفِتُوا نَظَرَهُ إِلَى كَلِمَةِ يَهْوَهَ لِيُسَاعِدُوهُ عَلَى ٱتِّخَاذِ ٱلْقَرَارِ ٱلْحَكِيمِ .‏