Canonum De Ius Virtus Naturae
Canons of Bioethics Law
II. Life
2.5 Medical Treatment
Article 54 - Blood transfusion
Canon 4929 (link)
Blood transfusion is the receiving of blood products into the circulation system of a higher level organism intravenously.
Canon 4930 (link)
There is no law in the Universe that prevents the receiving of biological material obtained in accordance with these Canons from another of the species.