How accurate is a paternity test?
1 min read · Reviewed Jun 9, 2026 · Updated Jun 9, 2026
Short answer
A properly collected and accredited DNA paternity test is highly accurate, commonly reporting probability of paternity above 99.9% when the tested man is the biological father and 0% when excluded.
What accuracy means
Paternity testing compares genetic markers from the child and alleged father. Including the mother can strengthen interpretation, but many cases can be tested without her sample.
What affects reliability
Identity checks, chain of custody, sample quality, and laboratory controls all influence whether a report is suitable for peace-of-mind or legal use.
Legal versus peace-of-mind testing
Legal testing requires verified identities and documented collection.
Frequently asked questions
Can a paternity test be wrong?
Errors are uncommon when collection, identity verification, and laboratory controls are followed.
Is the mother required?
The mother is helpful but not always required for a conclusive result.
Expert reviewed
Reviewed by Dr. Sharon O. Akinpelu, Clinical Laboratory Director.
This content is educational and is not a substitute for medical advice, diagnosis, or treatment from a qualified clinician.