surgery and doctors establish if there's any likelihood of a coagulation disorder because a transfusion is always a risk. enough blood transfusion introduces a range of foreign cells it's comparable to an organ transplant and house immunological consequences fictive. even a transfusion from the same blood group doesn't rule out a defensive reaction like fever hemorrhage or nausea. but we know that you can give a patient too much blood and overtaxed their circulation it could even cause a problem an area so it's extremely important to be very careful and only give the patient the exact quantity they need. bookkeeper in addition it's better to err on the side of caution hospitals have developed patient blood management programs to prevent blood loss during and after surgery for example doctors can use what's