[Self-determination and medical liability: blood transfusion in Jehovah's Witnesses patients] The present article begins with a brief analysis of the biblical reasons why Jehovah's Witnesses refuse transfusions, to analyze the right to self-determination of a patient, which is exercised through the express informed consent to medical treatment.Then, the article examines three situations that a doctor who is treating a Jehovah's Witness may face: a non-urgent clinical situation that allows

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... ent treatment choices; a condition that requires treatment choices obliged but deferrable over time; and, finally, a situation that forces the doctor to a single therapeutic choice not postponed and predictable.