Paternal Lineage (Y-STR) Test Paternal lineage (Y-STR) testing is a method for proving family relationships through the paternal line (the father’s side of the family). It is based on the fact that the Y chromosome is inherited from father to son relatively unchanged through many generations. The diagram on the right shows how the Y chromosome is inherited. Those who are in the same paternal line share very similar Y chromosome patterns. Test results may be used as additional evidence in complicated paternity and inheritance cases, for example, to supplement siblingship test results. Paternal lineage tests are performed using a Chain of Custody, a documentation process that makes the test results legally admissible (accepted by courts and other government agencies). If you would like to take the paternal lineage test for personal knowledge only and do not intend to use it for any legal purpose, please call one of our case managers at 1-888-362-2592 to discuss the in-home option. Tested Parties
Two or more males are tested in a paternal lineage test. Although females cannot participate in this test, a close male relative of the female (usually a full brother) may contribute a sample to indirectly determine the female’s relationship with a paternal lineage.
Painless Sample Collection
Our standard procedure uses the painless and non-invasive buccal swab—a cotton-like swab rubbed against the inside of your mouth to gather loose cheek cells. Convenient Appointment Locations
We have the largest sample collection network in the United States. If you live in the U.S., we can schedule your appointment at a location close to your home or work, often on the same day. There are thousands of collection sites affiliated with us all over the U.S. and worldwide. The collection facility charges a sample collection fee of $35 person. For your convenience, we pre-pay the collection fee and add it to your balance. Notarized Results
Results for paternal lineage tests are available within 9 days after we receive samples from all tested parties. Legal test results are signed by one of our M.D. or Ph.D. scientists and notarized. | 
Certified Quality Testing 
