part_of part of phenotype affects entity CD4-positive, alpha-beta memory T cell Abnormal CD4+ T cell subset proportion Abnormal memory T cell proportion Abnormal CD4+ memory T cell proportion Abnormal increase or decrease of the memory CD4+ T cell subpopulation, commonly characterized as CD45RA-, CD45RO+, or CD27-, measured as percentage of total CD4+ T cells in the blood, compared to a reference range for a given sex and age-group. Abnormal proportion of CD4-positive memory T cells blood proportion of CD4-positive, alpha-beta memory T cell relative to T cell in blood phenotype