<prompt> Phagocytic function is assessed by -Proloiferative response to mitogenReduction of NBT Nitroblue tetrazolium testSerum immunoglobulin assaySkin test with purified protein derivative  <response>: Lucocytes from the patients in chronic granulomatous disease fail to reduce nitroblue tetrazolium during phagocytosis. This nitroblue tetrazolium test access the phagocytic activity of leucocytes. Reference : Anathanarayan panikers 9th edition, pg no: 175 p 