Used in biomedical research to quantify glucose-6-phosphate isomerase (GPI) levels in human serum, plasma, or cell culture samples. Helps in studying autoimmune diseases such as rheumatoid arthritis, where GPI acts as an autoantigen. Also utilized in cancer research, as elevated GPI levels are associated with tumor progression and metastasis. Supports investigation into metabolic disorders and immune responses by providing a reliable measure of GPI concentration in experimental models. Widely applied in clinical laboratories and pharmaceutical development for biomarker validation and therapeutic monitoring.