BACKGROUND:Narrow-band imaging (NBI) bronchoscopy increases the diagnostic accuracy of lung cancer by enhancing mucosal surface structure images. The accuracy of NBI bronchoscopy for morphological abnormalities of tracheobronchial cells is unknown. This study aims to determine the diagnostic performance of NBI bronchoscopy in assessing tracheobronchial cell morphological abnormalities in nontumor mucosal airways.METHODS:This diagnostic study was conducted at Persahabatan Hospital from March 2023 to January 2024 using consecutive sampling. Participants aged over 18 with central lesions underwent NBI bronchoscopy. NBI vascular patterns were evaluated as the index test, with the gold standard being tracheobronchial cell morphological abnormalities assessed through histopathological examination. Diagnostic metrics, including sensitivity, specificity, and area under the curve (AUC …