Used in biomedical research to measure levels of cholecystokinin (CCK) peptide in rat samples. Enables quantification of CCK in plasma, serum, or tissue extracts for studies related to digestion, appetite regulation, and neuroendocrine function. Commonly applied in pharmacological and physiological experiments investigating gut-brain axis signaling. Provides high sensitivity and specificity for detecting small changes in CCK concentration. Supports research into metabolic disorders, stress responses, and gastrointestinal motility.