Table 1. Diagnostic criteria and staging for portopulmonary hypertension.
| Mean Ppa mmHg | Mean Ppcw# mmHg | PVR¶ dyn·s·cm−5 | |
| Mild | >25 to <35 | <15 | >240 |
| Moderate | ≥35 to <45 | <15 | >240 |
| Severe | ≥45 | <15 | >240 |
Ppa: pulmonary artery pressure; Ppcw: pulmonary capillary wedge pressure; PVR: pulmonary vascular resistance. #: a transpulmonary pressure gradient >12 mmHg could substitute this criterion in patients with an elevated mean Ppcw but fulfilling other criteria; ¶: a PVR >120 dyn·s·cm−5 is recommended by some authors.