Hexagon OBTI is the perfect complement to the Bluestar Forensic Reagents. This rapid screening test verifies that a suspected sample is human blood. Hexagon OBTI is a two-part test: a collection tube for the blood sample, and a test bar. A sample of the presumed human blood trace is transferred into the tube with transport medium. This mixture is added drop by drop to the test. A positive sample is typically detected within 2-3 minutes. A single blue line means the testing liquid is operational but no human blood has been detected. Two blue lines verifies the test has detected human blood. Provided as a package of 24 or 6 tests.