The device (1) has a blood extracting device formed as a piercing part (20) that projects into a cavity in a connected condition of housing sections. A connection unit has a connection section arranged in a measuring part (10) in a separating area and a connection counter section adapted to the connection section, where the connection counter section is arranged in the piercing part in the separating area. One of the sections forms a protective cap for a connection terminal that is connected with a standardized interface e.g. universal serial bus (USB)interface.
