Stanley A et al. BMJ 2017; 356:i6432
doi: http://dx.doi.org/10.1136/bmj.i6432 (Published 04 January 2017)
"Conclusions:
The Glasgow Blatchford score has high accuracy at
predicting need for hospital based intervention or
death. Scores of ≤1 appear the optimum threshold for
directing patients to outpatient management. AUROCs
of scores for the other endpoints are less than 0.80,
therefore their clinical utility for these outcomes
seems to be limited."