Dr. Andy Hoofnagle is a researcher, professor, board certified pathologist, and laboratory director at the University of Washington. He is Head of the Division of Chemistry, Director of Chemistry at the UW Medical Center – Montlake, Director of Clinical Mass Spectrometry, and Director of the Nutrition Obesity Research Center’s Analytic Core at the University of Washington. He is also Chair of the PCC’s Collagen Turnover Working Group. In this episode, he discusses his research and recent advances in the ability to detect growth hormone administration using biomarkers of collagen turnover. We also discussed Dr. Hoofnagle’s role as a mentor for PCC Research Fellow Dr. Huu Hien Huynh and his experience as a presenter at our 2025 PCC Conference.