Patent ID: 8828739

Claim:
In combination with a lateral flow analysis device of the type wherein a test strip having a sample application area, a test results zone, a control zone and optionally a reagent zone, is provided for detecting an analyte by an immunological or chemical technique, the analyte suspected of being present in a liquid sample, wherein the analyte is a drug, a hormone, an antibody, an etiological agent, a bacterium, a virus, or a portion thereof, or an antibody specific for that drug, and wherein the analyte is indicative of an etiological or disease state, the improvement comprising a first detectable and mobilizable dye indicator and a second detectable and immobilizable dye indicator located in the control zone, wherein the first detectable and mobilizable dye indicator prevents the second detectable and immobilizable dye indicator from visual detection by a user until contacted by an applied fluid sample thereby causing migration of the first detectable and mobilizable dye through said test strip by capillary flow of the applied fluid sample, the movement of said first detectable and mobilizable dye indicator being indicative of the movement of at least a portion of the fluid sample through the test result zone and optionally the completion of the assay.