The aim is to re-validate a FTIR spectroscopy test for measuring lung maturity/Respiratory Distress Syndrome (RDS) before conducting a RCT using this test to guide surfactant treatment of preterm infants. The test has been validated previously (NCT03235882) but needs re-validation due to continued improvement in accuracy and since the test is now developed into a Point of Care test (POC-test). The purpose is to accurately predict RDS using Lecithin/Sphingomyelin ratio (L/S ratio determined by a rapid FTIR in a newly developed point of care test (POC-test) on fresh gastric aspirates using retrospective analysis. The FAST 2 Validation Study is a part of the FAST 2 Trial consisting of a validation study and a subsequent randomized clinical trial, that will be registered separately on clinicaltrials.gov (NTC XXXXXXXXX)
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LS-ratio cut-off
Timeframe: 5 days