Patent ID: 6627459
Filing Date: 2003-09-30
Classification: G01N,Y10S

Abstract:
A test strip for immunoassay of at least one biological analyte in a sample comprising, in order of sample migration, a sample pad, a conjugate pad, a membrane containing a test site wherein the presence of said analyte in said sample is indicated by absence of color formation at said test site, said strip comprising a mobile positive control analyte immunologically distinct from said biological analyte in said sample pad, a labeled antibody specific to said control analyte in said conjugate pad, a labeled antibody specific to at least one of said biological analyte in said conjugate pad, an immobile control analyte at a positive control site in said membrane, and an immobile biological analyte at said test site in said membrane, said test strip indicating immunoassay function by absence of color formation at said control site, and said test strip indicating presence of said biological analyte at said test site by the absence of color formation at said test site.