Patent ID: 7901949

Claim:
A lateral flow immunoassay device for the detection of an analyte of interest in a liquid sample, comprising: a lateral flow test strip, the test strip in a dry state comprising: a) a mobilisable reporter species; b) a reagent zone having a mobilisable labelled species comprising a visually detectable label and, bound thereto, first and second binding agents, wherein the first binding agent is specific to the analyte of interest and the second binding agent is specific to the reporter species, wherein binding of the mobilisable labelled species and the reporter species forms a detectable complex; c) a trapping zone situated at or downstream of the reagent zone comprising an immobilised analyte of interest or a derivative of the analyte; and d) a detection zone situated downstream of the trapping zone comprising an immobilised capture reagent capable of binding the detectable complex of the reporter species and the mobilisable labelled species; wherein the mobilisable reporter species is situated upstream from the detection zone.