A method for characteristic monitoring in conjunction with a mode of continuously measured blood glucose values, in a monitor apparatus provided with a processor, a memory, a data interface, an input device, and a signaling device, the method comprising: - providing, on the signaling device, a menu to a user of the monitor apparatus, the menu comprising a first event, to which a first set of event specific characteristics of a continuous blood glucose monitoring is assigned, and a second event, which is different from the first event and to which a second set of event specific characteristics of the continuous blood glucose monitoring is assigned, the second set of event specific characteristics being different from the first set of event specific characteristics, - receiving user input data via the input device, the user input data comprising event selection data selecting the first event for which a starting first set of event specific characteristics is provided in the memory, - providing the first set of event specific characteristics in the processor, - receiving blood glucose value data comprising continuously measured blood glucose values by the processor, - providing the blood glucose value data and / or characteristic values derived from the blood glucose value data to the processor, - performing a safety check by comparing the first set of event specific characteristics to present characteristics of the continuous blood glucose monitoring derived from the blood glucose value data and / or the characteristic values by the processor, - generating by the processor a warning signal indicating one of an event activity related to the first event shall not be started and an event activity related to the first event and started before shall not be continued, if one or more of the present characteristics do not match the assigned characteristic from the first set of event specific characteristics, otherwise generating a safety signal, and - outputting an output signal according to the warning signal or the safety signal by the signaling device, the output signal comprising at least one of a visual signal and an acoustic signal. - providing, on the signaling device, a menu to a user of the monitor apparatus, the menu comprising a first event, to which a first set of event specific characteristics of a continuous blood glucose monitoring is assigned, and a second event, which is different from the first event and to which a second set of event specific characteristics of the continuous blood glucose monitoring is assigned, the second set of event specific characteristics being different from the first set of event specific characteristics, - receiving user input data via the input device, the user input data comprising event selection data selecting the first event for which a starting first set of event specific characteristics is provided in the memory, - providing the first set of event specific characteristics in the processor, - receiving blood glucose value data comprising continuously measured blood glucose values by the processor, - providing the blood glucose value data and / or characteristic values derived from the blood glucose value data to the processor, - performing a safety check by comparing the first set of event specific characteristics to present characteristics of the continuous blood glucose monitoring derived from the blood glucose value data and / or the characteristic values by the processor, - generating by the processor a warning signal indicating one of an event activity related to the first event shall not be started and an event activity related to the first event and started before shall not be continued, if one or more of the present characteristics do not match the assigned characteristic from the first set of event specific characteristics, otherwise generating a safety signal, and - outputting an output signal according to the warning signal or the safety signal by the signaling device, the output signal comprising at least one of a visual signal and an acoustic signal.