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Seracult Plus Fecal Occult Blood Tests are highly sensitive for early detection. Choose Seracult Plus guaiac tests by Propper when you need the reliability of a fecal occult blood test for 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 Kit Contains: 1 triple slide, 3 applicators and a U.S. Postal Service-approved mailing envelope. Packaged in two boxes: each contains 40 kits and two 15mL bottles of developer.