Welcome to the Land of Protocols, home of the Clinical Pathway (closely related to the Yellow Brick Road). (I'm not trying to make any direct connection to the Wiz, but…).
Let’s go back a few decades: a person presents to the ER with signs of sepsis and a low blood pressure. We evaluate the neck veins, listen to the lungs for crackles, maybe evaluate the BP response to Trendelenberg positioning.