The test is fairly sensitive to the presence of drugs in the urine. This means that if drugs are present, you will usually get a preliminary positive result. If you get a preliminary positive result, you should send the urine sample to the laboratory for a second, more accurate test.
It is very important to send the urine sample to the lab, because the drug of abuse urine screening may give positive results when no drugs are actually present. Certain foods, food supplements, beverages, diet pills, or over-the-counter medicines can cause a reaction with the tests. Laboratories use a very reliable test, with very few errors, to determine whether or not your sample contains drugs.
| Drug | Cutoff Conc. (ng/ml) | Test | Result Interpretation | |
| Correct | Incorrect | |||
| AMP | 1000 | 220 | 217 | 3 |
| BAR | 200 | 220 | 219 | 1 |
| BZD | 300 | 220 | 217 | 3 |
| COC | 300 | 220 | 219 | 1 |
| MET | 1000 | 220 | 219 | 1 |
| MOR | 2000 | 220 | 217 | 3 |
| MTD | 300 | 220 | 220 | 0 |
| PCP | 25 | 220 | 220 | 0 |
| THC | 50 | 220 | 219 | 1 |
| TCA | 1000 | 220 | 219 | 1 |
| XTC | 500 | 220 | 220 | 0 |
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