CEA Test Kits—immunoassay products that quantify carcinoembryonic antigen in serum, plasma, or whole blood—serve as critical adjuncts in colorectal-, lung-, and breast-cancer monitoring, guiding both therapeutic decisions and post-surgical surveillance. The global CEA Test Kits market size is projected to reach USD 1.84 billion in 2025, up from USD 1.54 billion in 2023, reflecting a resilient growth outlook underpinned by rising early-detection protocols and expanding utilization in emerging oncology pathways. Against a backdrop of aging demographics and shifting cancer epidemiology, the market forecast points to a 6.5% CAGR (2026-2033), with industry expansion catalyzed by laboratory consolidation, reimbursement tailwinds for companion diagnostics, and accelerating demand for point-of-care CEA testing across decentralized networks.