The Presanctified is used on the weekdays of Great Lent, a season of repentance, fasting, and intensified prayer when the more frequent reception of communion is desirable; however, the full Divine Liturgy having a joyful character is not in keeping with the somberness of the season of repentance (Eucharist literally means 'thanksgiving') and so the Presanctified is substituted.
If the consecrated Lamb is already on table of prothesis, the priest puts it on the diskos, pours wine and water in the chalice, covers and censes them.
During the second antiphon, the priest, preceded by a deacon with a lighted candle, processes round the holy table thrice, each time censing it in the form of a cross.
The priest then emerges from the altar carrying a candle and censer, proclaiming, 'The Light of Christ illumines all,' while the congregation make a prostration.
This is a litany which was historically used at all liturgies at this time, and is for those who have completed their catechism (thus ceasing to be catechumens) but must wait until Holy Saturday to be received into the church.
A different Cherubic Hymn to usual is used, and the Great Entrance takes place in a manner similar to that of the Divine Liturgy, except that the priest rather than the deacon carries the diskos, he holds it higher than the chalice, and the entrance is made in absolute silence, while everyone makes a full prostration.
Local opinion varies as to whether or not this unconsecrated wine must be thought of as the Blood of Christ (even if the bread was intincted).
On the previous Sunday, additional Lambs (hosts) are prepared and consecrated, enough for all of the Presanctified Liturgies that will be celebrated in the coming week.
The exact same ceremonies and actions accompany the preparation and consecration of the extra lambs, as the one which will be used that day at the Divine Liturgy.
In the Anglican Communion, the Book of Common Prayer for the United States provides likewise for the consecration of the reserved sacrament on Maundy Thursday and its reception at the special liturgy of Good Friday.