The present invention relates to a dry reagent assay device having at least one test zone and at least one reference zone, which provides an internal mechanism for assuring correct and reliable assay procedures and reagent qualities. In one embodiment, the present invention relates to an assay device...http://www.google.com.au/patents/US7635597?utm_source=gb-gplus-sharePatent US7635597 - Dry reagent particle assay and device having multiple test zones and method therefor
