Used in immunological research to quantify rat interleukin-9 (IL-9) levels in biological samples such as serum, plasma, or cell culture supernatants. This ELISA kit enables researchers to study the role of IL-9 in immune responses, allergic inflammation, asthma, and autoimmune diseases. It is particularly useful in preclinical studies involving rodent models to evaluate cytokine expression patterns and assess the impact of therapeutic interventions on Th9 cell activity. The assay provides high sensitivity and specificity, allowing for accurate measurement of IL-9 concentration in small sample volumes.