How do you use IVC collapsibility on POCUS to inform decisions for managing hypotension?

If a hypotensive patient is lying flat and spontaneously ventilating with a >50% collapse of the IVC (IVCmax - IVCmin/IVCmax x 100%) during a 'sniff' test then I would consider them 'volume tolerant'. They may not be responsive to IVF but it is unlikely that additional IVF will be harmful. Absolute ...