The Rapid Response™ Fentanyl Test Strip (Liquid/Powder) is a diagnostic test that is both cost-effective and user-friendly. It is a qualitative screening test that is rapid and reliable in its ability to detect fentanyl at cut-off levels exceeding 200 ng/mL. This substance test can generate precise and rapid results in as little as one minute. For forensic purposes only. This is not an IVD.