The growing demand for referrals is a main policy concern in health systems. One approach involves the development of demand management tools in the form of clinical prioritization to regulate patient referrals from primary care to specialist care. For clinical prioritization to be effective, it is critical that general practitioners (GPs) assess patient priority in the same way as specialists. The progressive development of IT tools in clinical practice, in the form of electronic referrals support systems (e-RSS), can facilitate clinical prioritization. In this study, we tested if higher use of e-RSS or higher use of high-priority categories was associated with the degree of agreement and therefore consensus on clinical priority between GPs and specialists. We found that higher use by GPs of the e-RSS tool was positively associated with greater degree of priority agreement with specialists, while higher use of the high-priority categories was associated with lower degree of priority agreement with specialists. Furthermore, female GPs, GPs in association with others, and GPs using a specific electronic medical record showed higher agreement with specialists. Our study therefore supports the use of electronic referrals systems to improve clinical prioritization and manage the demand of specialist visits and diagnostic tests. It also shows that there is scope for reducing excessive use by GPs of high-priority categories.