Used for the quantitative measurement of creatine kinase (CK) enzyme activity in rat biological samples such as serum, plasma, or tissue homogenates. This ELISA kit is commonly applied in research settings to assess muscle damage, myocardial injury, or neurodegenerative conditions in rat models. It enables high-throughput analysis with high specificity and sensitivity, making it suitable for preclinical studies in pharmacology, toxicology, and disease modeling where monitoring CK levels serves as a biomarker for cellular stress or tissue injury.