The Human IL-28A/IFN-lambda-2 (Interleukin 28A/ Interferon-lambda-2) ELISA (Enzyme-Linked Immunosorbent Assay) kit is an in vitro enzyme-linked immunosorbent assay for the quantitative measurement of Human IL-28A in serum (Human IL-28A concentration is pretty low in normal serum/plasma, it may not be detected in this assay), plasma, cell culture supernatants and urine.