Moreover, preterm infants with the isolated presence of BPD (n = 6, median: 869, IQR: 487–1138) or the isolated presence of BPD-related PH (n = 5, median: 894, IQR: 823–2176) had significantly higher NT-proBNP values compared to our reference values (p = 0.029 and p < 0.001). Here, NPPB is linked to bronchopulmonary dysplasia.