Are you familiar with the concept of oxygen debt or oxygen deficit?  What constitutes a “dose” of shock?  What systolic BP constitutes hypotension on the battlefield?  Where did the concept of permissive hypotension come from?  Is it still valid? How long can fresh whole blood last? Blood Transfusions were a huge topic at this year’s meeting in Charlotte with no less than 3 major speakers giving multiple talks on the subject. This talk was recorded during the Prolonged Field Care Pre-Conference Lab during the Special Operations Medicine and Scientific Assembly(SOMSA) by Dr. Geir Strandenes.