Table 3:
Sensitivity and Specificity of BTNX Rapid Response Fentanyl Single Drug Test Strip (20ng/ml) for Fentanyl and Fentanyl Analogs using Drug Samples Provided by Baltimore City Law Enforcement - By Drug Category
| Stimulants (Cocaine) | Prescription Opioids (oxycodone, tramadol, morphine) |
||
|---|---|---|---|
| Sample size (n) | 72 | Sample size (n) | 40 |
| Cocaine only | 66 | PO only | 20 |
| Cocaine and fentanyls | 5 | PO with fentanyls | 19 |
| Cocaine with all other CDS | 1 | PO with other CDS | 1 |
| Sensitivity (%) | 100.0 | Sensitivity (%) | 100.0 |
| False negative rate (%) | 0.0 | False negative rate (%) | 0.0 |
| Specificity (%) | 97.0 | Specificity (%) | 90.5 |
| False positive rate (%) | 3.0 | False positive rate (%) | 9.5 |
| Stimulants (Methamphetamine) |
Prescription Benzodiazpines (alprazolam,
clonazepam) |
||
| Sample size (n) | 25 | Sample size (n) | 10 |
| Methamphetamine only | 24 | PB only | 10 |
| Methamphetamine with fentanyls | 1 | ||
| Sensitivity (%) | – | Sensitivity (%) | -- |
| False negative rate (%) | – | False negative rate (%) | -- |
| Specificity (%) | 100.0 | Specificity (%) | 100.0 |
| False positive rate (%) | 0.0 | False positive rate (%) | 0.0 |
| Synthetic Cathinones (eutylone) | Heroin | ||
| Sample size (n) | 17 | Sample size (n) | 47 |
| Synthetic cathinones only | 17 | Heroin only | 2 |
| Heroin and fentanyls | 45 | ||
| Sensitivity (%) | -- | Sensitivity (%) | 100.0 |
| False negative rate (%) | -- | False negative rate (%) | 0.0 |
| Specificity (%) | 100.0 | Specificity (%) | – |
| False positive rate (%) | 0.0 | False positive rate (%) | – |
| Cannabinoids (delta-9-THC, cannabinoid, CBD) | 4-ANPP (fentanyl precursor) | ||
| Sample size (n) | 26 | Sample size (n) | 87 |
| Cannabinoids only | 25 | 4-ANPP with fentanyls | 87 |
| Delta-9-THC with fentanyl | 1 | ||
| Sensitivity (%) | – | Sensitivity (%) | 98.9 |
| False negative rate (%) | – | False negative rate (%) | 1.1 |
| Specificity (%) | 96.0 | Specificity (%) | -- |
| False positive rate (%) | 4.0 | False positive rate (%) | -- |
*
We excluded para-Fluorobutyryl fentanyl / 4-FBF / FBF; para-Fluoroisobutyrfentanyl / 4-FIBF / FIBF*; Para-chloroisobutyryl fentanyl / CIBF