A test slide for conducting a test of occult blood in feces is fabricated with a sheet of filter paper or other reagent carrier material impregnated with a test reagent and packaged in an envelope enclosure which overlies both sides of the reagent carrier sheet. One or more specimen apertures are provided...http://www.google.com/patents/US4983416?utm_source=gb-gplus-sharePatent US4983416 - Manufacturing method for an occult fecal blood test slide
