The Adacolumn is a new adsorptive type extracorporeal apheresis column, developed for selective adsorption of granulocytes monocytes/macrophages. The figure shows blood cell adsorption efficiency of Adacolumn carriers for patients with UC (n=56) and patients with rheumatoid arthritis (RA) (n=153) respectively. Each efficiency was calculated using the equation: adsorption efficiency (%) = number of adsorbed cells ÷ integrated cell count at the column inflow x 100. The results indicate that Adacolumn carriers are fairly selective for adsorption of granulocytes and monocytes/macrophages.