The Question-Answer (Q/R) service of Lyon's teaching hospital, offers reliable and updated information for healthcare professionals (HP). The impact of Q/R activity on patient outcome was measured by using a survey to assess user's satisfaction and impact on HP knowledge and/or patients cares. The compatibility of this tool with daily use had been assessed too. The survey was sent prospectively, for 9 months in 2018, to all HP whose enquiry was linked to a particular patient's care. The survey was posted 24-48h after the answer had been provided. 41 survey over 55 sent were returned (74.5%). The level of satisfaction measured is mostly good or excellent on all evaluated items. The HP surveyed consider that the responses provided have a potential positive impact on their professional knowledge and practices (97.6%), on the patient's care (n=36/37) and patient outcome (n=22/23). High level of satisfaction with the Q/R service and positive impact of this specialized Q/R service on improvement of HP knowledge and patient's care. This tool can be used in daily practice.