Only those who feel themselves properly prepared to receive Communion approach the altar. The Orthodox Church encourages parishioners to come prepared, if not every Sunday, at least once a month. It's an error to think that I can pick and choose when to receive. To follow Christ as an Orthodox, I must accept everything. After the Breaking of the Lamb, the priest consumes each consecrated element separately but then combines the Holy Body and Precious Blood of Christ in a chalice.
Parishioners then receive both elements combined using a common spoon.
This practice goes back to the early church. In its beginning, members received the elements separately. But some people were erring. They did not consume all of the Body at one time. With the only difference among all Orthodox Christians, Greek and Russian for instance, being their language, each can receive Communion in any Orthodox Church.