Patent ID: 7869009

Claim:
A method for determining an analyte concentration in a fluid sample, the method comprising the acts: providing a total transmission spectroscopy system including a first lens adapted to receive regular and scattered light transmitted through the sample, a second lens adapted to receive light from the first lens and adapted to output a substantially collimated beam of light, a light source, a sample cell receiving area and a detector; reacting the sample with a reagent adapted to produce a chromatic reaction in the sample cell receiving area of the system; illuminating the sample with a substantially collimated beam of near-infrared light output by the light source of the system; measuring the near-infrared light transmitted through the sample with the detector of the system; illuminating the sample with a substantially collimated beam of visible light output by the light source of the system; measuring the visible light transmitted through the sample with the detector; and determining the analyte concentration using information obtained from measuring the near-infrared light transmitted through the sample and from measuring the visible light transmitted through the sample.