The number of CD4+ lymphocytes indicates what condition the immune system is in. A CD4+ lymphocyte is a type of white blood cells and acts as the "commanding officer" that controls the immune functions to attack germs and viruses. About 700 to 1,500 CD4+ cells are found in 1��l of blood in blood in a healthy person. The higher the CD4+ cell count, the better it would be. HIV viruses replicate themselves within the infected CD4+ lymphocytes. They destroy the infected cells and as the result the number of CD4+ lymphocytes decreases. �� To compensate for the randomness in the cell counts, alway slook at the general trend of the data points taken from multiple tests.