Patent ID: 8449823

Claim:
A diagnostic tape unit comprising a tape cassette for blood sugar tests, the tape cassette having a test tape that is wound onto or can be wound onto a spool as a tape reel, the test tape comprising a light-transmitting transport tape and a plurality of spaced-apart test elements mounted thereon, the test elements each comprising an analytical reagent layer supported on a carrier foil layer, and further including an adhesive tape layer comprising a liner foil having adhesive on opposite sides and connecting the carrier foil layer adhered on the one side with the transport tape adhered on the opposite side, wherein a front side of the reagent layer faces away from the carrier foil layer and is configured for the application of a sample substance, the test elements in combination with the transport tape in each case forming an optical multi-layer system for a rear-side reflection-photometric measurement of the reagent layer, wherein the transport tape, the adhesive tape layer and the carrier foil layer of each test element each have optical properties comprising refractive index, transmission and haze, and wherein at least one optical property of the transport tape, adhesive tape layer and carrier foil layer are matched within predetermined tolerances.