Function Health secured $450 million in growth financing from General Catalyst’s Customer Value Fund, accelerating its preventive care push. The funding arrives about eight months after the lab-testing startup raised a $298 million Series B, bringing attention to how investors are treating longitudinal diagnostic and imaging services as scalable healthcare infrastructure. Function Health said it will use the capital to expand access to its testing and imaging offerings, targeting the preventive-care segment rather than only episodic diagnostics. The financing indicates that multi-modality testing businesses are increasingly being valued on growth in clinical utilization and service availability. For biotech and diagnostics stakeholders, the transaction signals continued appetite for preventive and longitudinal health models—especially when paired with infrastructure that supports high-throughput testing delivery.