Frequently asked questions (FAQ) BLUESTAR® OBTI

What does the acronym “OBTI” stand for?

OBTI stands for Occult Blood Test Immunochromatographic.

What are the differences between BLUESTAR® OBTI and BLUESTAR® Identi-HEM®?

  • Sensitivity:
    • OBTI: 0.05 µg/mL
    • Identi-HEM®: 0.01 µg/mL (more sensitive)
  • Specificity:
    • Identi-HEM® reacts to certain animal blood, especially from the mustelid family (e.g., martens, polecats).
  • Packaging:
    • Identi-HEM® is supplied with a sterile swab.
    • OBTI uses an attached piece inside the cap of the collection tube.
  • Shelf life:
    • OBTI: 18 months from factory dispatch
    • Identi-HEM®: 36 months from factory dispatch

Does BLUESTAR® OBTI require special storage conditions?

Yes. Store in a dry place at temperatures between 39°F and 86°F (4°C to 30°C).

How long does it wait to read an OBTI test ?

  • A positive result usually appears within 3 to 10 minutes after activating the test.
  • After 10 minutes, a test can be considered negative if no second line appears.

Refer to the user manual for detailed instructions.

Can I use BLUESTAR® OBTI after applying BLUESTAR® Forensic several times on the same area?

Yes. Multiple BLUESTAR® Forensic sprays do not prevent you from getting reliable results with BLUESTAR® OBTI.

Will BLUESTAR® OBTI react with synthetic blood?

No. BLUESTAR® OBTI only reacts to human hemoglobin and does not detect synthetic or animal blood.