Patent ID: 7229839
Filing Date: 2007-06-12
Classification: G01N,Y10S

Abstract:
1. A test strip adapted to receive a sample and detect an analyte therein, the test strip comprising: a sample addition zone to which a sample may be added; an absorbent zone positioned in a first flow direction relative to the sample addition zone; one or more test zones positioned in a second, different, flow direction relative to the sample addition zone, at least one of the test zones including a first analyte binding agent immobilized therein which is capable of binding to the analyte to be detected; and a terminal sample flow zone positioned in the second flow direction relative to the sample addition zone and distal to the one or more test zones, the absorbent zone having an absorption capacity relative to the other zones of the test strip such that when a sample is added to the sample addition zone, the sample initially diffuses from the sample addition zone both in the first flow direction to the absorbent zone and in the second flow direction past the one or more test zones to a distal diffusion point within the terminal sample flow zone and then reverses flow, and diffuses in the first flow direction past the one or more test zones toward the absorbent zone.