Table 1.

Severity-Based Diagnostic Criteria for BPD

Time point of assessment:	36 weeks postmenstrual age
Therapy with oxygen > 21% and/or respiratory support for ≥ 28 days and the following:
Mild BPD;	Baby is breathing room air
Moderate BPD;	Baby is in 22–29% oxygen, or 0.01–1.0 L/min
Severe BPD;	FiO2 ≥ 0.3, or low flow oxygen ≥ 1.1 L/min, or the baby is receiving any respiratory support (ventilation, CPAP, or high flow oxygen therapy) to achieve saturations of ≥ 91%