Abstract: The present invention relates to methods and apparatus for assays including optical bio-discs with spiral fluidic circuits and related detection systems. The optical bio-disc 110 includes a cap portion 116 having inlet and vent ports formed therein, a first channel layer 632 having cut-out portions, a second channel layer 634 having cut-out portions; a third channel layer 636 having cut-cut portions, a fourth channel layer 638 having cut-out portions, and a substantially circular substrate having a center and an outer edge. The cut-out portions are in register with each other such that when the bio-disc 110 is assembled a spiral fluidic circuit is formed having an inlet port, a mixing chamber 134, upper flow chambers 620, lower pass through chambers 622, inlet passages 626, outlet passages 628, a circumferential analysis chamber 618, and vent ports in fluid communication.

Abstract: Preparation and analysis of biomedical samples is performed using an optical bio-disc system. More specifically, chromatography, including for example, affinity, size exclusion, reverse phase, and ion exchange may be performed using an optical bio-disc system. Ion exchange chromatography may include anion exchange, cation exchange, cation exchange linked immunoassays (CELIA), and anion exchange linked immunoassays, in conjunction with calorimetric and/or fluorescent detection and quantization using an optical analysis disc or optical bio-disc. Improved methods for preparing assays, methods for depositing the reagents required for the assays, discs for performing assays, and detection systems are described herein.