Methadone and Metabolite, Serum or Plasma, Quantitative METHDN
| Method(s) | Liquid Chromatography - Tandem Mass Spectrometry |
|---|---|
| Specimen Required | |
| Collect | Two 6 mL plain red top tubes or one gray (sodium fluoride/potassium oxalate) top tube. Also acceptable: green (sodium heparin), lavender (EDTA), or pink (K2EDTA) top tubes. |
| Transport | 1 mL serum or plasma at 20-25ºC. (Min: 0.5 mL) |
| Stability | After separation from cells: Ambient:1 week; Refrigerated: 2 weeks; Frozen: 3 years |
| Unacceptable Conditions | Separator tubes. Plasma or whole blood collected in light blue top (sodium citrate) tubes. Specimens exposed to repeated freeze/thaw cycles. |
| Schedule | Mon-Fri |
| Billing Code | 5011536 |
| CPTCode | 80358 (Alt code: G0480) |
| Preferred Specimen Collection Device(s) | |
| Reference Interval | |
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Positive cutoff: 10 ng/mL |
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