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Diagnostic performance of NMS JWH-018 N-(5-hydroxypentyl) metabolite direct ELISA for 2492 urine samples. All samples confirmed by LC-MS/MS.
| Cutoff | 5 µg/L in PBS |
5 µg/L in Urine |
10 µg/L in PBS |
10 µg/L in Urine |
|---|---|---|---|---|
| True Positive | 262 | 242 | 226 | 207 |
| True Negative | 2174 | 2189 | 2195 | 2196 |
| False Positive | 29 | 14 | 8 | 7 |
| False Negative | 27 | 47 | 63 | 82 |
| Sensitivity % | 90.7 | 83.7 | 78.2 | 71.6 |
| Specificity % | 98.7 | 99.4 | 99.6 | 99.7 |
| Efficiency % | 97.8 | 97.6 | 97.2 | 96.4 |
