2.4 Laboratory tests
Peripheral blood lymphocyte subsets were tested in three cases at onset and in five cases in the remission period after immunosuppressant treatment. Flow cytometry was used to distinguish CD3+ T, CD4+T, CD8+T, CD19+B, and CD56+NK cells. The total number of cells in each subgroup was counted, and the corresponding percentages were calculated as well as CD4+/CD8+ ratio.