MEASUREMENT OF ANALYTE CONCENTRATION

摘要

A diagnostic test device that measures reflectance at two different optical wavelengths to determine the change in colour of one or more chemicals, the change in colour being dependent upon the concentration of an analyte in a fluid sample applied to the chemicals. The concentration of the analyte can be determined from the ratio of the reflectance values at the two different wavelengths. In a further embodiment the optical source(s) and the optical detector are arranged so as to be within the same optical axis.