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Drugs of Abuse Testing

Ordering the Right Test at the Right Time,
and What Does It Mean?


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September 2009

Dr. Loralie Langman discusses the prevalence of illicit drug use in the United States and describes testing for commonly encountered drugs. She also reviews drug detection limits, confirmation cutoffs, drug metabolism, and interpretation of screening and confirmation drug testing.


  • Loralie J. Langman, PhD DABCC (CC, MD, TC), DABFT consultant in the Division of Clinical Biochemistry and Immunology at Mayo Clinic. Dr. Langman is also the Director of the Toxicology and Drug Monitoring Laboratory at Mayo Clinic in Rochester, Minnesota.

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