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Genetic Testing Guides

Practical guides for genetic testing and DNA analysis. Compare 23andMe, AncestryDNA, and other services. Learn about polygenic risk scores, raw data interpretation, and how to get the most from your DNA results.

25 articles

The genetic testing landscape has evolved dramatically over the past decade. What once required a doctor's referral and cost thousands of dollars is now available to anyone for under $100 through direct-to-consumer services like 23andMe, AncestryDNA, MyHeritage DNA, and others. But navigating the world of genetic testing — from choosing the right service to interpreting your results — can be overwhelming without the right guidance.

Direct-to-consumer DNA tests typically use genotyping arrays (SNP chips) that read between 600,000 and 2 million specific positions across your genome. This is different from whole genome sequencing (WGS), which reads all 3 billion base pairs but costs significantly more. For most health and ancestry applications, SNP genotyping provides excellent coverage of clinically relevant variants at an accessible price point. The raw data file you receive — usually a text file containing your rsID numbers and genotypes — is the foundation for deeper analysis beyond what the testing company's reports cover.

Understanding your raw data requires knowledge of several key concepts. Each SNP (single nucleotide polymorphism) is identified by an "rs number" (like rs4680 or rs1801133) and reported with your genotype — two letters representing the alleles inherited from each parent. The significance of each genotype depends on population studies: risk allele frequencies, odds ratios, and clinical actionability all determine whether a variant is worth paying attention to. Polygenic risk scores (PRS) aggregate the effects of hundreds or thousands of variants to estimate your overall genetic risk for complex conditions like type 2 diabetes, coronary artery disease, or breast cancer.

One of the most valuable things you can do with your raw DNA data is upload it to interpretation services like Ask My DNA. While testing companies provide their own health reports, they typically cover only a fraction of the clinically relevant variants in your file. Third-party analysis can unlock insights into pharmacogenetics (how you metabolize medications), nutrigenomics (your nutritional genetic profile), carrier status for recessive conditions, and trait-related variants that your original test may not have reported.

When evaluating any genetic result, remember the distinction between clinical-grade testing (CLIA-certified labs with confirmed results) and consumer-grade genotyping (which has a small but real error rate of approximately 0.1–0.5%). For actionable medical decisions, always confirm consumer test findings with a clinical-grade test through your healthcare provider. Our articles in this section guide you through every step of the genetic testing journey — from choosing the right test to making the most of your results.

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