International Society of Blood Transfusion Committee on Terminology for Red Blood Cell Surface Antigens: Macao report

The committee met in Macao Special Administrative Region,China, during the 2008 International Society of Blood Trans-fusion (ISBT) Congress. Some changes to the classificationdocumented in Blood Group Terminology 2004 [1] and updatedin 2007 [2] were agreed and are described below. The fullupdated classification can be found on the blood groupterminology website at http://www.blood.co.uk/ibgrl. A newblood group system, the RHAG system, was established andnew antigens were added to the Rh, Kell, and Dombrocksystems (Table 1). A total of 308 antigens are now recognized,270 of which are clustered in 30 blood group systems.