We will cover AFAST and its abdominal fluid scoring system, its more recent weak positive-strong positive modification with its small volume-large volume principles for decision-making regarding fluid resuscitation, including blood transfusions versus crystalloids, and medical versus surgical clinical course. Patient subsets include trauma, blunt and penetrating, non-trauma, the collapsed patient, and post-interventional (The author's published T3 of AFAST -Trauma, Triage, Tracking). Our veterinary AFAST fluid scoring system that semi-quantitates ascitic volume has clear advantages for our patients over human medicine in which fluid scoring systems are not routinely used. Practical everyday cases are used to show this approach’s clinical impact.