DNA Paternity Test vs 23andMe: Why They're Not the Same
Published February 5, 2026 · Medically reviewed by the partner laboratory's medical director, AABB-accredited relationship-testing laboratory
23andMe uses SNP microarray technology to estimate ancestry and identify probable DNA relatives. A dedicated paternity test uses STR marker analysis specifically chosen to establish parent-child biological relationships with 99.99%+ certainty. 23andMe's "parent-child" relative match is a probabilistic estimate, not admissible evidence.
The tech difference
23andMe reads ~700,000 SNPs designed to reveal population-level ancestry. A paternity test reads 34 STR markers designed to establish direct parent-child relationships. Different markers, different math, different purposes.
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Why 23andMe can't be used legally
23andMe explicitly states in their terms that results are not diagnostic or admissible. There's no chain of custody, no photo ID verification, no signed lab-director report — none of which courts, USCIS, or SSA will accept.
When each is right
23andMe: heritage, health traits, finding distant DNA relatives. Dedicated paternity test: the paternity question, especially when the answer matters legally, medically, or personally.