#392 - Genetic testing: when it's valuable, how to choose the right test, and what to do with the results

Genetic testing serves as a tool for health assessment, yet its utility depends on the specific clinical question and the actionability of the results. Most genetic factors are probabilistic rather than deterministic, meaning direct phenotypic measurements—such as blood panels and imaging—frequently provide more immediate, actionable insights than DNA sequencing. While high-penetrance mutations like BRCA1/2 or specific pharmacogenetic markers offer clear clinical value, many consumer-grade tests for common variants like MTHFR lack sufficient evidence to justify specialized interventions. A rigorous approach to genetic testing requires identifying a precise objective, selecting the appropriate test type to minimize noise, and establishing a clear plan for how findings will influence medical or lifestyle decisions. Ultimately, the value of genetic information lies not in the data itself, but in its capacity to meaningfully guide clinical care and long-term health planning.