A medical device (10), medical method and graphical user interface (GUI) (18) displaying data regarding measurement of a physiological parameter. A window (22) for the physiological parameter is displayed using a display device (20). The window (22) includes an indicator (24) identifying a measured value of the physiological parameter. In response to automatic trigger of measurement of the physiological parameter, the window (22) is updated to further include a first indicator (34) indicating measurement of the physiological parameter is ongoing. In response to manual trigger of measurement of the physiological parameter, the window (22) is updated to replace the indicator (24) identifying the measured value with a second indicator (36) indicating measurement of the physiological parameter is ongoing. The second indicator (36) is prominent relative to the first indicator (34).