Half Siblings vs. Unrelated. In these sibling tests, the DNA of two individuals with different biological mothers is compared to determine the likelihood that they have the same biological father. For these tests, we recommend that samples from one—and preferably both—biological mothers be tested. This addition greatly increases the conclusiveness of the test.
It is important to understand that, unlike a traditional paternity test, it is not always possible to obtain a conclusive result in a DNA siblingship test. This is, in part, because the pattern of inheritance and degree of sharing of genetic markers between two siblings are not the same as that between a parent and child. In a sibling DNA test, the degree of certainty that can be achieved depends upon who is available for testing as well as the specific type of sibling relationship being tested. As a general rule, the more genetic information available, the greater the chance the test will be conclusive.
Endeavor DNA offers a 2 business day turnaround on siblingship tests utilizing either buccal swabs or specimen collection cards (WhatmanTM FTA® or WhatmanTM 903) with rush testing options available. Endeavor DNA can also test a multitude of other sample types, but longer turnaround times may apply.
All Endeavor DNA siblingship tests utilize stringent, validated testing procedures and include up to 22 STR loci plus the gender identification marker amelogenin in order to achieve 100% accurate results.