Used in biomedical research to measure chromogranin A (CgA) levels in human serum or plasma samples. This immunoassay kit helps in the study of neuroendocrine tumors, including pheochromocytoma, carcinoid tumors, and other conditions involving neuroendocrine cell activity. It enables quantitative detection of CgA, which serves as a biomarker for tumor presence, progression, and response to treatment. Commonly applied in clinical research settings and laboratory investigations to support diagnosis and monitoring when used alongside other diagnostic tools.