Hi, what a great post, I would think that the sun would be sufficient to keep the blood viable and flowing. This situation forces us to think "out of the box" and makes of experience and knowledge collide for the "best for the patient". I have thought about this a little more, and certainly, as the amount of blood in the bag decreases, and the time spent in 30C increases, the situation could become of increasing concern. The transfusion director of the blood bank and the attending physician would be and should be informed of the abnormal parameters involved for the patients best well being.