Used to measure human interleukin-29 (also known as IFN-λ) levels in biological samples such as serum, plasma, or cell culture supernatants. It is widely applied in immunology and virology research to study antiviral responses, as IL-29 plays a key role in innate immunity against viral infections. The kit helps in monitoring disease progression in conditions like hepatitis, influenza, and other viral diseases. It is also used in clinical research to evaluate immune modulation during therapy with interferons or in inflammatory disorders. Its high sensitivity and specificity make it suitable for detecting low concentrations of IL-29 in small sample volumes.