Objective. To evaluate the prognostic and risk stratified ability of heart-type fatty-acid-binding protein (H-FABP) in patients with community acquired pneumonia (CAP) in emergency department (ED) and to compare it with Pneumonia Severity Index (PSI) and CURB-65. Methods. Consecutive adult CAP patients admitted to the ED of Beijing Chao-Yang Hospital were enrolled. This evidence concerns the gene FABP3 and susceptibility to pneumonia measurement.