Table 1.
Performance of BTNX xylazine test strips compared to laboratory testing using LC-QTOF-MS.
| BTNX XTS |
Positive XTS and LC-QTOF-MS (agreement)a |
Negative XTS and Positive LC-QTOF-MS (disagreement) |
||
|---|---|---|---|---|
| n | % | n | % | |
| Any xylazine i.e., major, minor, trace (n=41)b | 4 | 22.2 | 14 | 77.8 |
| Major xylazine only (n=4) | 4 | 100.0 | 0 | 0.0 |
| Minor xylazine only (n=9) | 0 | 0.0 | 9 | 100.0 |
| Major or minor xylazine (excluding trace xylazine and lidocaine) |
3 | 25.0 | 9 | 75.0 |
a
ability to correctly identify xylazine.
b
33 of the samples were submitted as fentanyl or fentanyl with another substance, 4 were reported to contain methamphetamines, 2 were reported to be adderall, 2 were reported to be cocaine, 2 were reported to be benzodiazepines, 1 was reported to be xylazine, and 1 was unknown at the time of submission.