Reagents are disclosed for use in assays for analytes The reagents are dry assay reagents that may be readily reconstituted for use the assays The dry assay reagents comprise a solid support and one or more molecules of a receptor immobilized on the solid supp The receptor compnses one or more binding sites for a hgand A portion of a total number of the binding sites is bound to a conjugat comprising the ligand linked to a specific binding pair member and a portion of the total number of the binding sites is free Also provided are methods of detecting an analyte using the disclosed reagents.
