The systems of the invention include test cells with a first sorbent material defining a first flow path for a solution, a second sorbent material defining a second flow path distinct from the first flow path for a sample, and a test line or test site with immobilized antigens or antibodies or other...http://www.google.ca/patents/US7189522?utm_source=gb-gplus-sharePatent US7189522 - Dual path immunoassay device
