False-positive immunochemical screen for methadone attributable to metabolites of verapamil

Clin Chem. 1998 May;44(5):1039-41.
No abstract available

MeSH terms

  • Calcium Channel Blockers / urine*
  • Chromatography, High Pressure Liquid
  • Cross Reactions
  • False Positive Reactions
  • Gas Chromatography-Mass Spectrometry
  • Humans
  • Immunoenzyme Techniques
  • Methadone / urine*
  • Narcotics / urine*
  • Reagent Kits, Diagnostic
  • Substance Abuse Detection / methods*
  • Verapamil / urine*

Substances

  • Calcium Channel Blockers
  • Narcotics
  • Reagent Kits, Diagnostic
  • Verapamil
  • Methadone