Table National Institute of Child Health and Human Development Criteria for Diagnosis of Bronchopulmonary Dysplasia * < 32 Weeks Gestational Age† ≥ 32 Weeks Gestational Age‡ Diagnosis Breathing room air at 36 weeks PMA or discharge, whichever comes first Breathing room air by 56 days postnatal age or discharge, whichever comes first Mild BPD Need for < 30% oxygen at 36 weeks PMA or discharge, whichever comes first Need for < 30% oxygen at 56 days postnatal age or discharge, whichever comes first Moderate BPD Need for ≥ 30% oxygen, positive pressure, or both at 35 weeks PMA or discharge, whichever comes first Need for ≥ 30% oxygen, positive pressure, or both at 56 days postnatal age or discharge, whichever comes first Severe BPD * These criteria are in addition to the baseline diagnostic requirement of needing> 21% oxygen for at least 28 days or continued need for supplemental oxygen at ≥ 36 weeks PMA.