Estimates of central venous pressure based on inferior vena cava size and collapsibility
| Inferior vena cava size | Percent collapse | Estimated central venous pressure |
|---|---|---|
| ≤ 2.1 cm | > 50% | 3 mm Hg |
| ≤ 2.1 cm | < 50% | 8 mm Hg |
| > 2.1 cm | > 50% | 8 mm Hg |
| > 2.1 cm | < 50% | 15 mm Hg |
Based on reference 35.