Table 1.
Potential exogenous interferences tested by fortification of QC (150 pg/pad) samples at 10 000 pg/pad.
| 11-Hydroxy-Δ9-tetrahydrocannabinol | Cocaine | Norbuprenorphine |
| 2-Ethyl-5-methyl-3,3-diphenylpyrroline | Codeine | Norcocaethylene |
| 3,4-Methylenedioxyamphetamine | Cotinine | Norcocaine |
| 3,4-Methylenedioxyethyl-amphetamine | Dextromethorphan | Norcodeine |
| 3,4-Methylenedioxymethamphetamine | Diazepam | Norcotinine |
| 3-Methoxymethamphetamine | Diphenhydramine | Nordiazepam |
| 4-Bromo-2,5-dimethoxyphenethylamine | Ecgonine | Norfluoxetine |
| 4-Hydroxy-3-methoxyamphetamine | Ecgonine ethyl ester | Normorphine |
| 6-Acetylcodeine | Ecgonine methyl ester | Nornicotine |
| 6-Acetylmorphine | (±)-Ephedrine | Noroxycodone |
| 7-Aminoclonazepam | Flunitrazepam | Noroxymorphone |
| 7-Aminoflunitrazepam | Fluoxetine | Oxazepam |
| 7-Aminonitrazepam | Flurazepam | Oxycodone |
| Acetaminophen | Hydrocodone | Oxymorphone |
| Acetylsalicylic acid | Hydromorphone | Paraxetine |
| Alprazolam | Ibuprofen | Pentazocine |
| Amphetamine | Imipramine | Phencyclidine |
| Anhydroecgonine methyl ester | Ketamine | Phentermine |
| Benzodioxolylbutanamine | Lorazepam | P-hydroxyamphetamine |
| Benzoylecgonine | Methadone | P-hydroxybenzoylecgonine |
| Bromazepam | Methamphetamine | P-hydroxycocaine |
| Brompheniramine | M-hydroxybenzoylecgonine | P-hydroxymethamphetamine |
| Buprenorphine | M-hydroxycocaine | P-methoxyamphetamine |
| Caffeine | Morphine | P-methoxymethamphetamine |
| Cannabidiol | Morphine-3-glucuronide | Propoxyphene |
| Cannabigerol | Morphine-6-glucuronide | (±)-Pseudoephedrine |
| Cathinone | N-ethylamphetamine | Temazepam |
| Chlorpheniramine | Nicotine | Trans-3′-hydroxycotinine |
| Clomipramine | Nitrazepam | |
| Clonazepam | Norbenzoylecgonine | |
| Clonidine | 3,4-Methylenedioxy-N-methyl-butanamine | |
| Cocaethylene | 2-Ethylidene-1,5-dimethyl-3,3-diphenylpyrrolidine |