Used in biomedical research to quantify chromogranin A levels in rat samples, aiding in the study of neuroendocrine cell function and related diseases. Helps assess the activity of neuroendocrine tumors, monitor treatment response, and investigate stress responses, as CgA is released alongside catecholamines from chromaffin cells. Commonly applied in preclinical studies involving animal models of hypertension, heart failure, diabetes, and neurological disorders. Provides a reliable, sensitive, and specific method for measuring CgA in serum, plasma, or tissue extracts, supporting both basic research and drug development.