Its not required.

I know I'm just a heathen, unsaved, an inmoral Atheist and a baby killer but what in the name of Bob does one thing have to do with the other?

"The administration proper is an ordinance of two parts, the anointing and the sealing. An elder pours a small quantity of oil on the head of the one to be blessed, near the crown of the head if convenient, never on the other parts of the body, and in the name of the Lord and by authority of the priesthood, he anoints the person for the restoration of health. The sealing is performed by two or more elders, one of whom, as mouth, seals the anointing and gives an appropriate blessing, also in the name of Jesus Christ and by authority of the priesthood. Sometimes when oil is not available, or two brethren are not present, or when the sick one has recently been anointed, a substitute program is followed whereby one or more elders give a blessing, likewise in the name of the Lord and by authority of the Melchizedek Priesthood. He will pronounce such blessings as seem appropriate and as the Spirit moves. Then there is the prayer that is unlike the administration; it makes request to the Lord to heal and may be offered by any soul who has a desire to do so and is not an ordinance in the same sense. The prayer is a request for the Lord to act, whereas the blessing or the administration is given by the brethren in the name of Christ." Spencer W. Kimball, “President Kimball Speaks Out on Administration to the Sick,” New Era, Oct 1981, 45 You may find the whole article of interest: http://www.lds.org/ldsorg/v/index.jsp?hideNav=1&locale=0&sourceId=d6aaad74be99b010VgnVCM1000004d82620a____&vgnextoid=024644f8f206c010VgnVCM1000004d82620aRCRD