Used for the quantitative measurement of creatine phosphokinase (CPK) activity in rat biological samples such as serum, plasma, or tissue homogenates. This ELISA kit is commonly applied in preclinical research to assess muscle damage, myocardial injury, or neurodegenerative conditions in rat models. It enables researchers to monitor changes in CPK levels in response to drugs, toxins, or disease states, supporting studies in pharmacology, toxicology, and cardiovascular or neuromuscular research. The assay provides high specificity and sensitivity, allowing accurate detection of CPK activity differences across experimental groups.