I haven't read the entire decision in detail; can you cite the passage in the decision where they specifically excluded blood transfusions. It's my hope that the passage will give us at least a starting point for understanding and explaining why the court made the exclusion.
If there is no such passage in the decision, then I think we can safely say your question doesn't need to be answered (or even asked, now that I think about it).
Sure
pg 5 and 6.This decision concerns only the contraceptive mandate and
should not be understood to hold that all insurance-coverage mandates,
e.g.,
for vaccinations or blood transfusions, must necessarily
fall if they conflict with an employer’s religious beliefs. Nor does it
provide a shield for employers who
might cloak illegal discrimination
as a religious practice.