The invention concerns a disposable diagnostic part comprising a lancing element (14) which is designed for puncturing the skin (26) and has a collecting channel (16) for taking up body fluid, and comprising a detection element (18) which has a test layer (42) provided with reagents for the detection of an analyte in the body fluid and is disposed in the collecting channel (16). In order to ensure an improved stability and biocompatibility it is proposed that the detection element (18) is provided with a sealing layer (20) that is applied to the test layer (42) and covers the reagents.
