When a Jehovah’s Witness patient is traumatically injured, the lack of uniform professional consensus guidelines and the cultural knowledge deficit of many clinicians adds an additional layer of legal and ethical complexity to the inherent difficulty of managing a critically ill patient. We present here the case of an incapacitated Jehovah's Witness patient with severe traumatic hemorrhagic shock. We go on to discuss the historical and contemporary case law on proxy refusal of blood transfusion for the incapacitated adult, as well (...) as the ethics of self-determination and the application of the principle of proportionate reason in the management of the critically injured Jehovah's Witness patient. (shrink)