Patent ID: 7972837

Claim:
A kit for testing for the presence of an analyte in a test solution which comprises: i) a chromatographic strip having a contact end for contacting the test solution and a capture moiety immobilized at a capture zone of the chromatographic strip remote from the contact end, the capture moiety comprising a member of a ligand/anti-ligand binding pair capable of binding, other than by nucleic acid base pairing interaction, the analyte or a derivative thereof, as the other member of the ligand/anti-ligand binding pair; ii) separately from the chromatographic strip, a targeting agent capable of binding the analyte or derivative thereof, but which is not bound to the analyte or derivative, the targeting agent being provided with a plurality of ligands, and a plurality of labeling agents each bound to a ligand of the targeting agent, each labeling agent being provided with a label.