Table 2.

BPD diagnostic criteria for infants born <32 weeks PMA

Definition of BPD	Severity classification
	Mild	Moderate	Severe
Treatment with supplemental oxygen for ≥28 days	Breathing room air or nasal cannula with ≤1 L flow, FiO2 21%	Supplemental oxygen >21%, but <30%	Supplemental oxygen ≥30% or invasive or non-invasive positive pressure ventilation, including HFNC

Severity is classified at 36 weeks PMA.²²

BPD, bronchopulmonary dysplasia; FiO₂, fraction of inspired oxygen; HFNC, high flow nasal cannula; PMA, postmenstrual age.