Is the Fentanyl Result Real? Tackling Interfering Substances Amid the Opioid Epidemic Hsuan-Chieh Liao (1), Briana Fitch (2) (1)Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA (2)Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, CA Hsuan-Chieh (Joyce) Liao, PhD, DABCC, FADLM (Presenter) University of Washington Briana Fitch, PhD (Presenter) University of Southern California Presenter Bio: Dr. Joyce Liao has more than ten years of clinical and management experience in laboratory medicine. She was a medical laboratory scientist in the newborn screening lab and obtained her Ph.D. degree in Clinical Medicine. She completed postdoctoral fellowship training in Clinical Chemistry at the University of Washington and Seattle Children’s Hospital. She is a board-certified Clinical Chemist and now serves as an Associate Director at Harborview Medical Center, focusing on toxicology and mass spectrometry testing. She continues to focus on the translation of the analytical power of mass spectrometry to real clinical applications. Her interests include toxicology, mass spectrometry, and laboratory utilization. Presenter Bio: Briana Fitch received a PhD from the University of California San Francisco (UCSF) in Biomedical Sciences where she studied immunological and environmental causes of childhood leukemia. Her research focuses on developing and validating clinical mass spectrometry assays and immunoassays for cytokine measurement.