Used in immunological research to quantify rat interleukin-3 (IL-3) levels in biological samples such as serum, plasma, or cell culture supernatants. Enables researchers to study immune system activation, hematopoiesis, and inflammatory responses in rat models. Commonly applied in studies related to allergic reactions, asthma, and immune cell development. Provides a sensitive and specific means to monitor IL-3 concentration changes in experimental conditions, supporting drug development and disease mechanism investigations.