Used to measure levels of interleukin-13 (IL-13) in human biological samples such as serum, plasma, or cell culture supernatants with high sensitivity. This assay is commonly applied in immunology and inflammation research to study conditions like asthma, allergic responses, and autoimmune diseases where IL-13 plays a key regulatory role. The high sensitivity allows detection of low cytokine concentrations, making it suitable for studies requiring precise quantification of small changes in IL-13 expression. It is widely used in clinical research and drug development to evaluate therapeutic efficacy and immune response modulation.