Sibling DNA testing is designed to determine sibling genetic relationships.DNA Sibling testcan be performed to determine whether two people are full or half siblings and to analyze the relationship of biological siblings by collecting samples from both siblings; however, including one common parent increases the accuracy of this type of analysis, and is highly recommended.

There are two different types ofDNA sibling test;a Full Sibling Test and Half sibling Test. A full sibling test is used to determine if two people share the same mother and father. This test is usually performed when both parties know they have the same mother and wish to find out if they have the same father. If two people have the same father and mother they are full siblings. If however two people share only one parent, be it either a mother or father they are half siblings. The Half sibling test is usually performed when two people know that they do not have the same mother and are trying to determine if they have the same father.

The sibling test is conducted in the same manner as a regular mother, father, and child paternity test. Swabs are placed in the mouths of the various parties and samples of DNA are obtained. The parties giving their DNA must then sign a consent form giving their consent for their DNA to be tested. Once the swabs have arrived in the laboratory for a sibling test, results are usually ready within eight working days, unless an extended study of the DNA samples is required which will delay the process by an additional four working days.

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