Device and method for immunoassay determinations

An assay support, generally planar and elongated in shape, comprises a gripping section (16) a sample receiving well section (12), and a connecting section (14) therebetween, each of the sections being aligned along a longitudinal axis. The sample receiving well section comprises at least two spaced-apart receiving wells (18, 20) each of which has an open end on a first face of the support, a concave inner surface extending concavely into the support, and a convex outer surface which projects convexly from an opposed face of the support. The convex outer surface of at least one of the wells is provided with at least one stabilising leg (21) and the assay support is also provided with a levelling projection (25) which cooperates with the stabilising leg(s) to maintain the support level when resting on a flat surface. The sample receiving section is also provided with a dam means (22) adapted to preclude the flow of a liquid sample from one of the wells to another.