An “avuncular” test determines if a person is biologically related to a sibling of the father in question. This test is a good option when the father is not available for testing, and the only relative available is a single sibling (brother or sister) of the father.

Siblings share approximately 50% of their DNA, therefore an uncle or aunt shares about 25% of their DNA with a nephew/niece. DDC has the most extensive array of genetic markers available to resolve biological relationship like aunt – uncle testing, which is often another way to determine paternity. Other labs do not have this extensive set of markers.