Abstract: A handheld analysis device for examining a sample of body fluid, such as blood to analyze blood glucose, has a setting mode for changing various device settings to improve the changing of device settings. The handheld analysis device comprises a measurement unit, a microprocessor, a segment display, and an operating element. When the operating element is actuated, the device is placed in a selection mode and further actuation of the operating element, then in one of several setting modes, the user can efficiently change device settings by inputting data and/or control commands.

Abstract: In particular for the measurement of blood glucose concentrations, portable diagnostic devices are disclosed that are user-friendly and safe to handle. A method is proposed which controls the range of functions of diagnostic devices and avoids incorrect operation of diagnostic devices of this kind, by substantially preventing unintentional and unnoticed alteration of critical parameters, typically system time and/or system date. The method includes a key-recognition step and an enable step. The key-recognition step determines whether at least one key module is connected to the diagnostic device. Depending on whether such a connection exists, the alteration of at least one critical parameter stored and/or generated in the diagnostic device is permitted or prevented in the enable step.