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Summary of results obtained from 100 real hair samples
| Target analyte | Number of positive samples | Range of concentrations (pg/mg) | Mean pg/mg | Median pg/mg |
|---|---|---|---|---|
| Fentanyl | 68 | LOQ–1400 | 93 | 17 |
| Norfentanyl | 17 | 3.5–600 | 69 | 8.4 |
| Acetylfentanyl | 14 | LOQ–230 | 29 | 2.5 |
| Furanylfentanyl | 28 | LOQ–6300 | 310 | 8.4 |
| Acrylfentanyl | 2 | LOQ | – | – |
| 4-Fluorobutyrfentanyl | 6 | 5.2–180 | 69 | 24 |
| Cyclopropylfentanyl | 1 | 4.7 | – | |
| Butyrfentanyl | 1 | 54 | ||
| 4-ANPP | 20 | 1.4–230 | 22 | 4.1 |
