Friday, February 6, 2009

Items that may be used for DNA testing

By PTC Labs

Most laboratories prefer buccal swab for DNA testing. A cotton swab that looks like a one sided Q-tip is rubbed in the mouth on the inside of the cheek. Loose cells are collected on the swab and they provide the DNA for a paternity test.

It is also common to collect blood for DNA testing. In most cases there is no advantage to collecting blood over collecting a buccal swab, and there are several disadvantages to collecting blood. Buccal swabs are painless! Collecting blood requires a minimum of a finger stick. Blood can transmit serious diseases such as HIV and Hepatitis. Buccal swabs do not have the same biological risks as blood.

The DNA from a buccal swab is exactly the same as the DNA from blood. There is no scientific advantage of using one over the other. The DNA is contained in the nucleus of the cells and it is identical in a cheek cell and a white blood cell.

Some people may not want to have a buccal swab or blood collection. They may want to perform a DNA test using anonymous samples. There are many reasons for performing an anonymous paternity test. Often the subject is very controversial and the parent does not want the child to know that they are being tested.

Anonymous DNA tests are often performed on unusual items. Items such as a toothbrush or discarded tissue may be sued. Anonymous tests generally do not provide names for the individuals testing. Often, the item is named. For example:

The donor of the DNA on the buccal swab is excluded as the biological father of the donor of the DNA on the cigarette butt.

One situation is that the mother has a child that her husband believes is his biological child. She does not want to tell the husband and causes a major problem for the family unless the child is not his. She may send a DNA sample from her and her child and a toothbrush from the alleged father. If he is the father, then her worries are over. There is no need to disrupt the family with a legal test. If he is not the father, then she has to deal with it, but was able to find out without disrupting her family.

A variety of items may be used for DNA paternity testing. They include, cigarette butts, bandage with blood, baby pacifiers, used tissue, tooth brush, and plastic soda straws.

It is absolutely necessary that the provided items that have only been used by one person. If there is even a remote possibility that a second person used the same razor, or drank for the same soda straw, then do not send that item for a DNA test. You could receive an incorrect test result, and the item will very likely result in an unusable profile.

Peace of mind without family disruption is the most common reason for an anonymous paternity test. Anonymous paternity tests may be requested by mothers, fathers, grandparents and adult children. - 15784

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