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. Author manuscript; available in PMC: 2022 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2022 Aug 31;240:109610. doi: 10.1016/j.drugalcdep.2022.109610

Table 1:

Detection Limits Established using Laboratory-Grade Fentanyl and Fentanyl Analogs for the BTNX Rapid Response Fentanyl Single Drug Test Strip (20ng/ml)

JHU
(Clinical Chemistry
Laboratory)
BTNX
(Manufacturer)
Country United States Canada
Solvent Water Urine
Fentanyl 200 ng/ml 20 ng/ml
Fentanyl Analogs reported by BTNX that were tested
 Acetyl Fentanyl 100 ng/ml 150 ng/ml
 Butyryl Fentanyl 100 ng/ml 700 ng/ml
 Carfentanil Not detected* 1,000 ng/ml
 Furanyl Fentanyl Not detected* 500 ng/ml
 Valeryl Fentanyl 500 ng/ml 700 ng/ml
Fentanyl Analogs not reported by BTNX that were tested
 4+ANPP 200 ng/ml --
 Alfentanyl Not detected* --
 Alpha+methylacetyl fentanyl 500 ng/ml --
 B+methylfentanyl 500 ng/ml --
 FIBF 200 ng/ml --
 FBF 100 ng/ml --
 n+methyl norfentanyl 500 ng/ml --
 norfentanyl Not detected* --
 ortho+methylacetyl fentanyl 100 ng/ml --
 para+chloroisobutyryl fentanyl 1000 ng/ml --
 phenyl fentanyl 500 ng/ml --
 thiofentanyl 200 ng/ml --
Fentanyl Analogs reported by BTNX that were not tested
 3-Methyl Fentanyl -- 500 ng/ml
 Ocfentanil -- 250 ng/ml
 p-Fluoro Fentanyl -- 200 ng/ml
 Remifentanil -- 70,000 ng/ml
 Sufentanil -- 100,000 ng/ml
*

at 1000 ng/ml or less