Used in biomedical research to quantify Rat Nickel Grass Protein (METRNL) levels in biological samples such as serum, plasma, or tissue homogenates. The kit enables researchers to study the role of METRNL in metabolic regulation, inflammation, and energy homeostasis. It is commonly applied in studies related to obesity, diabetes, and exercise physiology where METRNL expression changes are investigated. The ELISA format allows for high sensitivity and specificity, making it suitable for detecting low concentrations of the protein in experimental models.