National Institutes of Health (NIH) consensus definition for diagnosis of bronchopulmonary dysplasia (BPD) and assessing severity in infants
| <32 weeks birth GA | ≥32 weeks birth GA | |
| Time of assessment | 36 weeks CGA or discharge (whichever comes first) | >28 days but <56 days postnatal age or discharge (whichever comes first) |
| Treatment with oxygen >21% for ≥28 days plus: | ||
| Mild BPD | Room air at 36 weeks CGA or discharge | Room air by 56 days postnatal age or discharge |
| Moderate BPD | FIO2 <30% at 36 weeks CGA or discharge | FIO2 <30% by 56 days postnatal age or discharge |
| Severe BPD | FIO2 ≥30% and/or positive pressure ventilation at 36 weeks CGA or discharge | FIO2 ≥30% and/or positive pressure ventilation by 56 days postnatal age or discharge |
Reproduced and modified from [5] with permission. GA: gestational age; CGA: corrected gestational age; FIO2: inspiratory oxygen fraction.