Patent ID: 7709248

Claim:
A bioassay system, comprising: means for dropping a solution of a fluorescence-labeled target substance in a reaction region of a bioassay substrate containing a detection substance, the detection substance interacting with the fluorescence-labeled target substance to prepare a reaction product, the bioassay substrate including a wavelength selective layer at a bottom portion of the reaction region, wherein the reaction region is spirally arranged on the bioassay substrate; means for condensing fluorescence emitted from the fluorescence-labeled target substance through the wavelength selective layer and a back surface of the reaction region to determine an intensity of the fluorescence, the fluorescence being produced by irradiating excitation light of a first wavelength onto the reaction product; and means for controlling the means for dropping the solution based on tracking information of the reaction region and focus information of a control laser beam of a second wavelength irradiated to and reflected from the wavelength selective layer and the back surface of the reaction region, the second wavelength being different from the first wavelength.