1. An assay test strip, comprising: a flow path for a fluid sample; a sample receiving zone coupled to the flow path; a label that specifically binds a target analyte; a detection zone coupled to the flow path and comprising a test region that comprises an immobilized test reagent and a control region that comprises an immobilized control reagent, wherein the test reagent and control reagent are immobilized in discrete code areas forming a bar code pattern that encodes information.