Intraobserver and interobserver reliability of visible light spectroscopy during upper gastrointestinal endoscopy

Background: Visible light spectroscopy (VLS) performed during upper gastrointestinal endoscopy allows measuring mucosal oxygen saturation levels to determine gastrointestinal ischemia. We aimed to determine the observer variability of VLS.Methods: This is a single-center prospective study of 24 patients planned for usual care upper endoscopy. To test intraobserver variability, VLS measurements were performed in duplicate by a single endoscopist...