The invention relates to a test device for analyzing body fluids such as blood or urine, comprising a wound test tape (16), which can be conveyed from a supply area (24) to a disposal area (28) and which has a multitude of test sections that can be subjected to the action of body fluid at an absorbing position (20), and comprising a measuring unit (18) for detecting a constituent of the body fluid on an active test section (38). For carrying out device auxiliary functions, the invention provides that the test tape (16) has, in addition to the test sections, one or more functional sections (40) that can be brought into a functional position by advancing the tape.