Application of CD4+CD70+T cell subset in preparing reagent for auxiliary diagnosis of very severe aplastic anemia

The invention discloses an application of CD4+CD70+T cell subset in preparing reagent for auxiliary diagnosis of very severe aplastic anemia. According to the invention, the inventor finds for the first time that the proportion of CD4+CD70+T cell in the peripheral blood of AA patients is obviously reduced in A patients, especially, is most obvious in VSAA, which can be used as one of related testindices for auxiliary diagnosis of laboratory immunization of VSAA patients, and meanwhile, provides important reference data for selection of treatment strategy for VSAA patients clinically.