In the Presbyterian Church (U.S.A.), ALL are invited to the Lord’s Table and may receive the sacrament. From the PC(USA) Constitution,

“The opportunity to eat and drink with Christ is not a right bestowed upon the worthy, but a privilege given to the undeserving who come in faith, repentance, and love. All who come to the table are offered the bread and cup, regardless of their age or understanding. If some of those who come have not yet been baptized, an invitation to baptismal preparation and Baptism will be graciously extended…

Even those who doubt may come to the table to be assured of God's love and grace in Jesus Christ.”