HemoCue Hemoccult Sensa FOBT Slides (64151A). Hemoccult II SENSA is the enhanced Hemoccult product that provides improved readability, intense blue reaction and higher clinical sensitivity over regular Hemoccult and other FOBTs. Hemoccult II SENSA has been proven to give the highest clinical sensitivity readings (92%) and offers the ability to find more true positives of occult blood. 14-day on-slide stability. CLIA waived. Each box contains (100) Single slides plus (2) 15mL Bottle Developer. Price per box.