| 摘要 |
An object of the present invention is to provide latex particles with high production reproducibility, by which a sufficiently high value of signal ”S (= value of signal - value of noise) can be realized in immunodiagnosis. The present invention provides a method for assay which comprises steps of (1) causing a substance to be detected to come into contact with or compete with binding substance-labeled fluorescent latex particles which are obtained by causing a binding substance to bind to fluorescent latex particles, and (2) measuring fluorescence from the binding substance-labeled fluorescent latex particles, wherein: (a) the fluorescent latex particles are obtained by adding a fluorescent substance to latex particles characterized in that the amount of COOH groups existing on the surfaces of the latex particles is from 40 µeq/g to 300 µeq/g, or (b) the fluorescent latex particles contain latex particles and a fluorescent substance, which are characterized in that the amount of COOH groups existing on the surfaces of the fluorescent latex particles is from 40 µeq/g to 300 µeq/g.
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