A blood gas analyzer (1) for performing a measurement on analyte parameters in a blood sample, such as a whole blood sample, aspirated into the blood gas analyzer from a blood sample container comprises an output device, such as a monitor (30), for outputting instructions to a user of the blood gas analyzer for the user's handling of the one or more of the user-accessible parts of the blood gas analyzer, such as for maintenance purposes, and/or for replacement of sensor cassettes, gaskets, probes, solution packs, etc. A controller (8) is provided for receiving a signal, on the basis of which it is determined if an instruction, such as an animated video instruction, is to be presented to the user. In the affirmative, the controller selects one of a plurality of pre-stored sets of instructions for outputting at the output device.
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