In more detail:
The vatican has left it up to each country’s confrence of bishops to choose how each country’s faithful will recieve:
The following adaptation of GIRM 160 was approved by the Holy See for the United States.
- The priest then takes the paten or ciborium and goes to the communicants, who, as a rule, approach in a procession.
The faithful are not permitted to take the consecrated bread or the sacred chalice by themselves and, still less, to hand them from one to another. The norm for reception of Holy Communion in the dioceses of the United States is standing. Communicants should not be denied Holy Communion because they kneel. Rather, such instances should be addressed pastorally, by providing the faithful with proper catechesis on the reasons for this norm.
When receiving Holy Communion, the communicant bows his or her head before the Sacrament as a gesture of reverence and receives the Body of the Lord from the minister. The consecrated host may be received either on the tongue or in the hand, at the discretion of each communicant. When Holy Communion is received under both kinds, the sign of reverence is also made before receiving the Precious Blood.
Recognized by the Congregation for Divine Worship and the Discipline of the Sacraments, 17 April 2002, and, promulgated as particular law of the United States by Decree of the President of the USCCB, Bishop Wilton Gregory, 25 April 2002.