Accuracy of Lung Injury Biomarkers in the Initial Investigation of Patients With Suspected Pneumonia

"Blood samples will be collected by a medical laboratory technologist and transferred to the local laboratory for analysis of surfactant protein D, Krebs von den Lungen (KL-6), and YKL-40. Laboratory staff will be blinded to participant diagnosis and outcome. None of the biomarkers will be available to the treating physician.~* Diagnostic test of surfactant protein D - will be quantified using enzyme-linked immunosorbent assay (ELISA)-based analysis~* Diagnostic test of KL-6: will be quantified using enzyme-linked immunosorbent assay (ELISA)-based analysis~* Diagnostic test of YKL-40 - will be quantified using enzyme-linked immunosorbent assay (ELISA)-based analysis"