Various studies have reported biomarkers associated with neonatal lung injury allowing the prediction of development of risk for BPD.24 Most of the studies that have reported biomarkers in BPD have been done in the initial few weeks of the preterm infant’s life.25 In this study, no difference was noted in the serum TRX-1 levels between controls and patients with BPD or ROP irrespective of the severity of illness. Here, TXN is linked to bronchopulmonary dysplasia.