Seracult Plus Single Slide Fecal Occult Blood Test 374001. Seracult Plus Fecal Occult Blood Tests are highly sensitive for early detection of early stages of colorectal cancer and adenomas. These tests detect hemoglobin as low as 0.32mg/100mL (d.i. water diluted). The performance of each test is assured with a foolproof performance control built into each test slide. The performance control is tested and interpreted immediately after the specimens have been developed, giving clear indication that the components of the test are functioning correctly. Each box contains: (100) single slides, (2) 15mL bottles of developer, and (100) applicators. Priced per box. FREE Shipping!