Saw in a chart once that the patient is allergic to oxygen..... yep.
We have a “bloodless” program. Get the patients to have IV iron, sometimes epo, to get their numbers up. Also have some mechanism to get substitute blood (never used it nor seen it being used...).
Recently a partner did a bowel resection for colon ca. Patient end up losing a lot of blood did okay initially, Hgb 6. A day or two later, BRBPR, hgb4. Asked him before surgery if he will have transfusion. No minced words, “you will die” even if you survived surgery. Nope... Took him in, got him through, dead a few hours later.