Fast Assessment of Surfactant Deficiency to Speed up Treatment

The aim is to validate a FTIR spectroscopy test for measuring lung maturity/Respiratory Distress Syndrome (RDS) in terms of safety, usability, and efficacy. The purpose is to accurately predict RDS using Lecithin/Sphingomyelin ratio (L/S ratio determined by a rapid FTIR test on fresh gastric aspirates) using retrospective analysis. Research question: "In very preterm newborn infants with (risk of) respiratory distress who have not received prophylactic surfactant: does analysis of L/S-ratio in fresh gastric aspirates using a rapid FTIR test predict RDS requiring exogenous surfactant with sufficient specificity and sensitivity to be clinical useful?