This type of relational DNA test can prove the paternity of two males within the same paternal lineage, and is typically done when the alleged father is deceased, the alleged paternal grandparents are deceased or unavailable, and there are no other samples available for testing.

This test can only be performed within the paternal line of the person in question since males receive their Y-chromosome only from the father.

The reason this DNA test is effective is that the Y-chromosome is passed from father to son relatively unchanged through many generations.

The Y-Chromosome test examines specific locations on the Y-chromosome to generate a Y-STR profile for each male tested.  Males who are related through their fathers will tend to have the same or similar Y-STR profiles, and males who are not related will likely have different Y-STR profiles.

Two (2) or more males are required for this test.  Average turnaround for results is five (5) business days from receipt of all samples. 



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7 reasons why you should use The Paternity Lab for your YSTR DNA testing need:

  • Your call will NEVER go to Voicemail during working hours.
  • We have never lost a client because of price.
  • Once you agree on price and make a deposit via credit card your appointment can be set for same day or next day if desired.
  • We also provide mobile collection service if you need us to come to you.
  • On the day of your appointment you will not wait in long lines as we honor your time. Many customers come to our locations during their lunch hour.
  • After you’re collection is complete your samples will be sent to the lab via priority mail (1-2 days) at which point the balance will be charged to your credit card.
  • The turnaround time for paternity and/or maternity DNA testing is approximately two business days from the time all samples arrive to the lab. For other types of DNA testing, such as postmortem viability testing or sibling DNA testing, the turnaround time can be up to five business days.