Abstract: When the quantification of an analyte is based on a color change detected by a change in the amount of light transmitted or reflected, undiluted samples often saturate the detection range of the assay. Thus, very often, the sample needs to be diluted for reliable quantification. Disclosed are systems and method, including various configurations of fluidic circuits for us on an optical bio-disc, that advantageously allow the use of undiluted and/or whole blood samples for colorimetric assays on optical bio-disc is described.

Abstract: Methods for decreasing non-specific bindings of beads in dual bead assays and related optical bio-discs and disc drive systems. Methods include identifying whether a target agent is present in a biological sample and mixing capture beads each having at least one transport probe affixed thereto, reporter beads each having at least one signal probe affixed thereto, and a biological sample. Mixing is performed under binding conditions to permit formation of a dual bead complex if the target agent is present in the sample. The reporter bead and capture bead each are bound to the target agent. Denaturing the target agent and keeping it in the denatured form by use of a specialized hybridization buffer is also provided. A denaturing agent is guanidine isothiocynate.

Abstract: A wide variety of current diagnostic and other biochemical tests employ a substance, such as a chromagen, that undergoes a detectable color development or change of fluorescent emission in the presence of the analyte of interest. The intensity of the color or fluorescence developed may be time dependent and proportional to the concentration of the analyte of interest. Systems, methods, and components usable for quantifying the concentration of an analyte of interest in a biological sample on optical biodiscs are disclosed herein. Analytes may include, for example, glucose, cholesterol, and triglycerides. In one embodiment, reagents are immobilized on the optical disc prior to the assay.