Laboratory medicine generates data that informs most clinical decisions, yet the profession is often evaluated primarily on test production rather than diagnostic impact. The authors present the Triple Attribution Leadership Model, aligning three complementary leadership pillars. This article describes a Leadership Model that includes the Pathologist as Clinical Care Leader, the Doctorate in Clinical Laboratory Science (DCLS) as Operational Leader, and the Advanced Medical Laboratory Scientist (MLS) as Analytics Leader to reposition the clinical laboratory as healthcare’s first responder and a catalyst for population health. Grounded in Clinical Lab 2.0 principles (1) and aligned with system-level value frameworks (2), the model transitions organizations from reactive confirmation based on symptom presentation to proactive prediction using longitudinal biomarkers. We describe the rationale, governance, implementation roadmap, and a Mass General Brigham (MGB) case example, and conclude with policy recommendations that support value-based diagnostic practice.