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IVC diameter predicts volume status

A collapsible IVC under 2.1 cm suggests low right atrial pressure. This is one of the most clinically impactful measurements you can provide.

IVC diameter < 2.1 cm that collapses > 50% with inspiration suggests low right atrial pressure (< 5 mmHg). This is a critical finding for fluid management decisions — document the collapse response, not just the diameter.