A method of “non-isopyknic” cell isolation and purification has the steps of adding a sample of blood to a defined volume to a corresponding ratio volume of EDTA solution to produce a volume of anti-coagulated blood; taking a predetermined volume of the anti-coagulated blood and placing it in a first tube containing a selected defined volume of PSS, wherein the selected defined volume of PSS is taken from a group of defined volumes of PSS, as each defined volume of PSS establishes a specific cell type to be purified; centrifuging the tube for a first predetermined time and speed to form a volume of supernatant of plasma/PSS and a bottom sedimented volume of mostly red blood cells; extracting the supernatant to within a proximity of an interface between the sedimented red blood cells and the supernatant; transferring an appropriate, pre-selected volume amount of the supernatant into a second tube holding a defined volume of physiological media (RHAE); mixing the solutions gently; centrifuging for a second predetermined speed and time; and pouring off the supernatant wherein at the bottom of the tube will be a cell button containing a volume of the selected purified cells in a high percentage and a very small quantity or low percentage of some contaminating non-selected cells. This method is useful in establishing high purity concentrations of selected cells from whole blood such as monocytes, lymphocytes, neutrophils and basophils.