Abstract: A test and method is provided for the analysis of one or more analytes in a fluid test sample. The test includes a carrier of an absorbent material, which exhibits light reflectance within a first spectral range. A plurality of test fields are located on the surface of the carrier, and include test field materials reactive with the analytes and exhibiting light reflectance within a second spectral range. The test fields are located in spaced relation to one another on the carrier, so that gaps between the test fields exhibit light reflectances within the first spectral range. The gaps and test fields have relative sizes which are optically discernable, and which form a coded sequence that correlates to information relating to the test.