SKU: 1405
  • $115.20

Bluestar OBTI Bluestar OBTI is the perfect complement to BLUESTAR® FORENSIC. This rapid screening test presumes that a bloodstain is of human origin. This helps the investigator to choose to collect or not a sample as evidence. A positive result indicates a strong likelihood for the presence of human blood. A lab analysis will later confirm or infirm this presumption. Bluestar 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 working fine but no human blood has been detected, two blue lines mean the test has detected human blood. Principle Bluestar OBTI test and control linesHuman hemoglobin (hHb) in the sample reacts with a reagent consisting of blue colored particles and monoclonal anti-human Hb antibodies. The immunocomplex migrates to the test zone where it is captured by an immobilized second antibody directed against hHb forming a blue test line to indicate a positive result. Unreacted reagents migrate further and are bound in a second line by immobilized anti-mouse lgC antibodies. This control line indicates proper function and correct handling of the test. The test detects whole blood up to a dilution of 1 : 1,000,000. As little as 500 red cells are required for a positive result. 


Can be purchased in these quantities:

  • 24/case
  • 6/box