Used in biomedical research to quantify levels of carboxylesterase 1 (CES1) enzyme in rat samples. This ELISA kit enables researchers to study drug metabolism, liver function, and the role of CES1 in hydrolyzing ester-containing compounds. It is particularly useful in pharmacokinetic studies, toxicology research, and evaluating metabolic enzyme expression in experimental models. The assay provides a sensitive and specific measurement of CES1 protein concentration in tissue homogenates, serum, or other biological fluids from rats.