Urine Drug Testing Interpretation: A Toxicologist’s Perspective on Common Clinical Challenges

Interpreting urine drug testing (UDT) results can present clinicians a host of challenges. Assessing specimen tampering, marijuana abstinence, and alcohol consumption are particularly challenging, common scenarios. This case-based program, led by toxicologists, will highlight these difficult scenarios, giving clinicians a greater understanding of each to support improved clinical decision making.


Title: Urine Drug Testing Interpretation: A Toxicologist’s Perspective on Common Clinical Challenges
Duration: 1 hour
Objectives: Upon completion of this session participants will be able to:

  • Briefly overview the clinical use of urine drug testing
  • Identify the major markers that constitute specimen validity testing and what each means to UDT interpretation
  • Recognize ways patients may attempt to circumvent UDT through dilution, adulteration and substitution methods
  • Utilize tools and resources to create risk management plans for patients in practice
  • Discuss UDT interpretation of alcohol use


Javier Velasco, PhD

Dr. Velasco obtained his BS in Biochemistry and Cell Biology from the University of California and his Ph.D. in Molecular and Environmental Toxicology from the University of Wisconsin – Madison. He is a licensed Clinical Toxicology Scientist with nearly 30 years of experience and as such, lectures and publishes in the area of toxicology. He is a current member of the Society of Forensic Toxicology, Inc. and has been a past member of other organizations, such as the California Association of Toxicologists, the SoCal SETAC (Society of Environmental Toxicology and Chemistry) and the American Association for Clinical Chemistry. Dr. Velasco is a Laboratory Inspector for the National Laboratory Certification Program, NLCP (SAMHSA formerly NIDA) and the College of American Pathologists. He also has significant experience as an expert witness regarding narcotics, toxicology and DUI in civil and criminal cases. In Javier’s spare time, he works in environmental conservation, with a particular focus on protecting endangered sea turtles.

William Bundy, PharmD

William Bundy, PharmD, is a Clinical Toxicologist at Millennium Health. He received his PharmD from the University of Florida College Of Pharmacy and subsequently completed a specialty pharmacy residency in pain and palliative care at Lakeland Regional Medical Center in Lakeland, FL. Following his residency, Bill was the lead clinical pharmacist for the Pain and Palliative Care Service and the Co-director of the Pain and Palliative Care residency program. He then joined Carillion Regional Medical Center in Roanoke, VA as an oncology pharmacist. Dr. Bundy has published in the area of pain management and palliative care and has lectured nationally on these topics as well.

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