1. A method performed by an implantable medical device, comprising: receiving instructions from an external device to obtain a baseline value for an indicator of infection in proximity to the implantable medical device; obtaining the baseline value following receipt of the instructions; monitoring the indicator of infection in proximity to the device; and determining whether the monitored indicator is indicative of infection in proximity to the device, wherein determining whether the monitored indicator is indicative of infection comprises comparing a value associated with the monitored indicator to the baseline value.