*Redemptionis Sacramentum
On certain matters to be observed or to be avoided regarding the Most Holy Eucharist
By: The Congregation for Divine Worship and Discipline of the Sacraments
- The distribution of Holy Communion
[88.] The faithful should normally receive sacramental Communion of the Eucharist during Mass itself, at the moment laid down by the rite of celebration, that is to say, just after the Priest celebrant’s Communion.[172] It is the Priest celebrant’s responsibility to minister Communion, perhaps assisted by other Priests or Deacons; and he should not resume the Mass until after the Communion of the faithful is concluded. Only when there is a necessity may extraordinary ministers assist the Priest celebrant in accordance with the norm of law.[173]
[89.] “So that even by means of the signs Communion may stand out more clearly as a participation in the Sacrifice being celebrated”,[174] it is preferable that the faithful be able to receive hosts consecrated in the same Mass.[175]
[90.] “The faithful should receive Communion kneeling or standing, as the Conference of Bishops will have determined”, with its acts having received the recognitio of the Apostolic See.
“However, if they receive Communion standing, it is recommended that they give due reverence before the reception of the Sacrament, as set forth in the same norms”.[176]
[91.] In distributing Holy Communion it is to be remembered that “sacred ministers may not deny the sacraments to those who seek them in a reasonable manner, are rightly disposed, and are not prohibited by law from receiving them”.[177] Hence any baptized Catholic who is not prevented by law must be admitted to Holy Communion. Therefore, it is not licit to deny Holy Communion to any of Christ’s faithful solely on the grounds, for example, that the person wishes to receive the Eucharist kneeling or standing.
[92.] Although each of the faithful always has the right to receive Holy Communion on the tongue, at his choice,[178] if any communicant should wish to receive the Sacrament in the hand, in areas where the Bishops’ Conference with the recognitio of the Apostolic See has given permission, the sacred host is to be administered to him or her.
However, special care should be taken to ensure that the host is consumed by the communicant in the presence of the minister, so that no one goes away carrying the Eucharistic species in his hand. If there is a risk of profanation, then Holy Communion should not be given in the hand to the faithful.[179]
[93.] The Communion-plate for the Communion of the faithful should be retained, so as to avoid the danger of the sacred host or some fragment of it falling.[180]*
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As pointed out by others ad nauseum, current norms allow for Communion in hand while standing. Remember this wasn’t the case for the past 1500 years or so, but that’s another matter. What is significant here is if one chooses to receive in hand while standing - other things are required. If one chooses to receive on tongue while kneeling no such stipulations apply. Therefore, kneeling is more reverent than standing and on tongue is better than in hand.