Used in immunological research to quantitatively measure soluble CD8 molecule levels in biological samples such as serum, plasma, or cell culture supernatants. Enables researchers to monitor T-cell activation and immune response in studies related to viral infections, autoimmune diseases, and cancer immunotherapy. Commonly applied in clinical research and drug development to assess immune system dynamics and treatment efficacy. Provides a reliable, high-throughput method for detecting CD8 biomarkers in human samples.