T-4 count

T-4 count A test that counts the number of T-4 cells in the blood, for example, to assess the immune status of a patient with HIV. Of the various ways to read a T-4 count test, the best indicator of health may be the absolute T-4 count, the actual number of T-cells per unit volume of blood. Also known as T-helper count. See also helper/suppressor ratio; T cell.