When comparing all 4 grades of BPD of preterm infants with existing NT-proBNP values at 4 ± 1 weeks of life (no BPD: n = 45, mild BPD: n = 19, moderate BPD: n = 6 and severe BPD: n = 1), NT-proBNP values were significantly higher in infants with mild or moderate BPD than in infants without BPD (p < 0.001 and p = 0.031). Here, NPPB is linked to bronchopulmonary dysplasia.