CVP Estimation using IVC Diameter and Collapsibility 
< 1.5cm IVC, >50% collapsibility = 0-5 mm Hg (Low CVP)
< 1.5-2.5cm IVC, >50% collapsibility = 6-10 mm Hg
1.5-2.5cm IVC, <50% collapsibility = 11-15 mm Hg
>2.5cm IVC, <50% collapsibility = 16-20 mm Hg (High CVP)

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