Interpreting Consumer Genetic Test Results Responsibly

Back to Journal

What These Tests Can and Can't Tell You

Direct-to-consumer genetic tests typically use genotyping arrays that check for specific known variants, rather than full genome sequencing — meaning they can miss rare or novel variants and are generally much better at confirming well-established associations than at generating a complete individual risk profile. For most common conditions, genetics is one contributing factor among many (lifestyle, environment, and chance), which is why most polygenic results are expressed as relative risk shifts rather than certainties.

The Polygenic Score Caveat

Polygenic risk scores, which aggregate the small effects of many variants into a single risk estimate, have improved substantially but were developed predominantly using data from populations of European ancestry, meaning their predictive accuracy is measurably lower for people of other ancestries. A consumer report's confident-looking percentage can obscure a much wider margin of uncertainty than the presentation suggests, particularly for anyone outside the ancestry group the underlying research was built on.

Actionable vs. Interesting Findings

Some findings are genuinely actionable — certain well-validated pharmacogenomic variants affecting drug metabolism, for instance, can meaningfully inform prescribing decisions when reviewed by a physician or pharmacist. Many other findings, particularly trait predictions (sleep chronotype, caffeine metabolism, and similar) are interesting but shouldn't drive major lifestyle or medical decisions on their own, since their real-world predictive power is often modest.

Getting a Second, Clinical Read

Anyone who receives a result suggesting elevated risk for a serious hereditary condition — certain cancer or cardiac risk variants, for example — should have that finding reviewed and, where appropriate, confirmed through clinical-grade testing and genetic counselling with a licensed professional, rather than acting on a consumer report alone. Genetic counsellors are specifically trained to translate probabilistic genetic information into individualised guidance, which a general-purpose consumer report is not designed to provide.

Helix Privé is a Singapore-based private healthcare concierge and navigation service. We help clients organise, understand and navigate healthcare options, appointments, providers, records and logistics. Helix Privé is not a clinic and does not diagnose, prescribe or provide medical treatment. Clinical decisions remain with appropriately licensed healthcare professionals.