Siblingship Testing

When determining siblingship, individuals are tested to determine whether they share the same biological parents or parent. Full siblings are individuals who have the same biological mother and the same biological father. Half siblings share only one parent.
When siblings have the same parent(s), they have matching genes much more often than do two unrelated individuals. When matches between two potential siblings are found, calculations are made to determine the probability that a sibling relationship exists.

Our test for siblings usually shows a number of genetic matches in true biological siblings. In such cases, the our test for siblings may show the probability of siblingship to be greater than 99%, provided the tested alleged siblings inherited genes are not commonly present in the population. Our test for siblings is a useful and informative test. However, in some cases, testing additional known family members (in addition to the potential siblings) greatly improves the accuracy of this DNA test.