| abstract |
An analytical device consisting of porous material(s) that permit(s) liquid to migrate therein, the device comprising in the migration direction. The device comprises a first zone onto which a sample suspected of containing an analyte to be assayed can be applied, a second zone incorporating a non-immobilised molecule capable of specifically binding to the analyte, said molecule is provided with a detectable label, a third zone capable of retarding the rate of migration of the sample and the non-immobilised molecule, and a fourth zone incorporating in at least part of the zone an immobilised state the same type of analyte as the one to be assayed or an analogue thereof being capable of specifically binding to the non-immobilised molecule. |