A departmental audit of clinical use of N2O can be helpful on multiple fronts. It allows comparison between procurement and clinical use, with any discrepancies helping identify leaks within the N2O infrastructure. It also allows for understanding of N2O clinical use patterns within the department to help focus interventions to help reduce clinical use of N2O. At SCGH we used both a clinical use survey and anaesthetic machine interrogation to get the required data. We received the procurement data from our local gas provider which in WA is BOC gas. Below are links to our generic survey and machine interrogation information.