$10.00 per Kit ($1.00/Test)

100 Tests/Kit 10 Tests/ Kit

Product Information
  • Product Code: FYL-18S7-10
  • Quantity: 10 Tests/ Kit
  • Sample: Urine/Liquid/Powder
  • Format: Strip
  • Sensitivity: 20 ng/mL (Urine) and 200 ng/mL (Liquid/Powder)
  • Specificity: Fentanyl
  • Accuracy: > 98%
  • Time-to-Result: Instant Results
  • Storage Condition: 2-30°C/36-86°F
  • Test Principle: Lateral Flow Immunoassay
  • 10 Test strips
  • Product Insert


The Rapid Response™ Fentanyl (FYL) Test Strip is a lateral flow chromatographic immunoassay for the qualitative detection of Fentanyl in liquid or powder specimens above the cut-off concentration of 200ng/mL and in urine specimens above the cut-off concentration of 20 ng/mL.

John Hopkins Bloomberg School of Public Health found BTNX's Rapid Response™ Fentanyl Test Strips showed the lowest detection limit and highest accuracy among other fentanyl detection methods tested. Read the study here! 

The Vancouver Coastal Health Authority offers Rapid Response™ Fentanyl Strips at their overdose prevention and supervised consumption sites and in their take-home drug testing kits. Read more here. 


  • Individually packaged strips for easy distribution
  • Simple testing procedure
  • Results in just 1 minute*
  • Built-in procedural control on every strip
  • Interpretation of test results are: positive (one line), negative (two lines), invalid (no lines or no control line)



Detects Fentanyl Analogues including:

  • Carfentanyl
  • Butyryl Fentanyl
  • p-Fluoro Fentanyl
  • Acetyl Fentanyl
  • Fentanyl
  • Furanyl Fentanyl
  • Valeryl Fentanyl
  • Ocfentanil
  • 3-Methyl Fentanyl
  • Remifentanil
  • Sufentanil


* A negative result can be interpreted as soon as both the test (T) and control (C) lines appear. A positive result can be interpreted once the control line has appeared and the background has cleared to white, typically by 60 seconds. Do not read results after 10 minutes.

  • The test device is NOT intended to determine the purity, composition, or if the substance being examined is safe to use. 
  • A positive or negative test result is NOT an indication that the substance being examined is safe to use. Many factors come into play when examining the samples, including but not limited to mixture of multiple substances, solubility, and pH of the sample. 
  • BTNX Inc. does not encourage the use, supply, or production of illegal drugs or controlled substances in any way. The device is intended for harm reduction purposes. Follow the advice of your local harm reduction or public health agency. 
  • There is a possibility that technical or procedural errors as well as other substances and factors may interfere with the Rapid ResponseTM Fentanyl Test Strip (Urine) and cause false results.
  • A positive result indicates the presence of fentanyl only and does not indicate quantity.
  • A negative result does not at any time rule out the presence of fentanyl, as they may be present below the minimum detection level of the test.
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