Iityhubhu zokuqokelelwa kwegazi ezincinci: zilungele ukuqokelelwa kwegazi kwiintsana ezisanda kuzalwa, iintsana, izigulana ezingaphumeleliyo kwiiyunithi zokhathalelo olunzulu, kunye
izigulana zokutshisa kakhulu ezingafanelanga ukuqokelela igazi le-venous. Ityhubhu yokuqokelela igazi yincinci yoxinzelelo olungeyongxakiityhubhu, kunye nendlela yokusetyenziswa kwayo iyahambelana netyhubhu yokuqokelela igazi yombala ofanayo.