The Glasgow-Blatchford Score (GBS) was developed by Blatchford and colleagues in 2000 using data from 1,748 patients presenting to a Scottish district general hospital with upper GI bleeding. Unlike the Rockall score, GBS can be calculated entirely at the bedside before endoscopy, using only clinical and basic laboratory variables. Its primary utility is to identify patients at sufficiently low risk (score = 0) to be safely discharged without endoscopy — a powerful triage tool in emergency settings. Multiple studies have shown GBS score of 0 carries a negative predictive value >99% for need for intervention.