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Matrix effects 10 different lots of oral fluid were fortified with QC material to a concentration of 7.5 ng/mL and the %CV determined of the analyte/IS area ratio.
| Matrix comparison | |
|---|---|
| Drug/Metabolite | %CV analyte/IS ratio |
| Amphetamine∗ | 3.39 |
| Methamphetamine∗ | 4.60 |
| D-amphetamine | 1.59 |
| L-amphetamine | 2.35 |
| D-methamphetamine | 7.54 |
| L-methamphetamine | 3.09 |
∗ Indicates combined D- and L-.
