Particle-labelled immunoassays: a review.

Up to now, various types of particles have been used as labels in immunoassay. Well known examples are erythrocytes and latex particles. More recently, colloidal gold and dye particles have been introduced as a label. Each type of particle offers one (or more) method(s) of detection which depend(s) on the physical properties of the particles. In this paper, the present state-of-the-art regarding particle-labelled immunoassays will be reviewed.