noun
autotransfusion
Medical term for reinfusing a patient's own blood, often collected before surgery.
手術前に自己血輸血の準備をした。
We prepared for autotransfusion before the surgery.
輸血 is general blood transfusion, while 自己血輸血 specifically refers to using the patient's own blood.
Compound of 自己 (self) + 血 (blood) + 輸血 (blood transfusion).