Your Free Guide to Choosing a DNA Test

Understanding DNA Testing Basics

DNA testing has become increasingly common over the past two decades. A DNA test examines your genetic material—the instructions that make you who you are—by analyzing a sample, usually saliva or a cheek swab. The test looks at specific locations in your DNA called markers or variants to gather information about your ancestry, health predispositions, or traits.

There are several main types of DNA tests available to consumers. Ancestry tests trace your family lineage and ethnic background by comparing your DNA to reference populations around the world. These tests can reveal what percentage of your DNA comes from different regions and may help you connect with distant relatives who have also tested. Health-related tests examine your DNA for variations associated with certain diseases, conditions, or medication responses. Trait tests look at genes that influence physical characteristics like eye color, height, or caffeine metabolism. Some companies offer multiple test types in a single package.

The science behind DNA testing relies on comparing millions of your genetic markers against databases of known variations. When you take a test, the company sequences portions of your DNA and looks for patterns. For ancestry, they compare your results to reference populations to estimate where your ancestors came from. For health tests, they look for specific genetic variants that research has linked to increased disease risk or medication sensitivity.

It's important to understand that DNA tests provide information based on current scientific knowledge, which continues to evolve. A genetic variant associated with a health condition today may be understood differently as research advances. Similarly, ancestry results depend on the reference databases companies use—these databases grow and change as more people test.

Practical Takeaway: Before choosing a test, identify what type of information interests you most: ancestry, health insights, or trait information. Understanding these categories helps you narrow down which companies and tests match your actual interests.

Types of DNA Tests Available

DNA tests fall into three broad categories, and understanding each helps you make an informed decision about what information you might receive.

Ancestry and genealogy tests are the most widely used consumer DNA tests. Companies like AncestryDNA, 23andMe, and MyHeritage analyze your autosomal DNA—the DNA you inherit from both parents—to estimate your ethnic background and connect you with biological relatives. These tests typically break down your ancestry into percentages from different regions. For example, a result might show 45% Northern European, 30% Southern European, and 25% West Asian ancestry. Many ancestry tests also include a genealogy component that lets you build a family tree and potentially contact others who share DNA with you. According to industry data, over 30 million people have taken at least one DNA ancestry test, creating large databases that improve matching capabilities.

Health and wellness tests examine your DNA for variations linked to health conditions, carrier status for genetic disorders, or medication responses. These tests can reveal whether you carry one copy of a gene for conditions like cystic fibrosis or sickle cell disease (carrier status means you likely won't develop the condition but could pass it to children if your partner also carries the gene). Some health tests show predisposition information—for example, a genetic variant associated with increased breast cancer risk. Important: carrying a genetic variant does not mean you will definitely develop a condition. Your lifestyle, environment, and other genes also play significant roles. The FDA has cleared certain genetic tests for marketing to consumers, though others have not undergone FDA review.

Traits and wellness tests provide information about physical characteristics and wellness-related traits influenced by genetics. These might include muscle composition, caffeine metabolism, ability to taste certain compounds, or sleep patterns. Trait information is often interesting but less medically significant than health tests. Many companies bundle trait information with ancestry or health results.

Some companies offer combined packages. 23andMe, for example, offers ancestry plus health reports in some of their test options. Other companies focus on a single category—for instance, some specialize only in ancestry, while others focus exclusively on health or fitness traits.

Practical Takeaway: List the specific types of information you're interested in learning, then research which companies offer tests in those categories. This prevents you from paying for information you don't want.

Evaluating Company Reputation and Accuracy

Not all DNA testing companies are equal. Before sending your genetic material to any company, research their track record for accuracy, privacy practices, and customer service. Several factors help you evaluate a company's credibility.

Laboratory certification and standards: Look for whether the company's laboratory holds CLIA (Clinical Laboratory Improvement Amendments) certification, which indicates it meets federal standards for clinical testing. CLIA certification doesn't guarantee perfect accuracy, but it shows the lab follows established quality controls. Some companies are also CAP (College of American Pathologists) accredited, which represents an additional level of quality oversight. You can usually find this information on the company's website or contact them directly to ask about certifications.

Scientific accuracy and validation: Research how the company validates its tests and whether their methods have been published in scientific literature. Companies that publish their research in peer-reviewed journals demonstrate commitment to transparency. Look for information about their reference databases—ancestry tests using larger, more diverse databases tend to provide more accurate ancestry estimates. Reading customer reviews and experiences can reveal whether people feel their results were reasonable and matched family histories they knew.

Privacy and data security: This is crucial. Research the company's privacy policy carefully. Key questions include: Who owns your genetic data? Can the company sell or share your DNA information? What happens to your data if the company is sold or shuts down? Do they store raw data indefinitely or delete it after results are sent? Some companies offer different privacy options—for instance, you might be able to opt out of having your data included in research studies. Check whether the company allows law enforcement access to your DNA data and under what circumstances.

Customer service and transparency: Look at how companies handle customer questions and complaints. Check review sites and social media for how responsive they are to problems. A company that clearly explains what their tests can and cannot do demonstrates responsibility.

Practical Takeaway: Before purchasing any DNA test, spend 15-20 minutes researching the company online. Read their privacy policy, check for CLIA certification, and look at customer reviews. This research often reveals important information about accuracy and how your data will be treated.

Understanding Costs, Packages, and Hidden Fees

DNA testing costs vary widely, typically ranging from $99 to $300 for initial tests, though prices fluctuate based on promotions. Understanding what you're paying for and what additional costs might arise helps you choose a test that fits your budget and needs.

Base test prices: Ancestry-only tests are often the least expensive, frequently available in the $99-$150 range during sales. Health and ancestry combined tests typically cost $150-$230. Specialized health tests focused on a specific condition or detailed health analysis may cost more. Many companies run seasonal promotions—ancestry tests are often discounted around holidays. Some companies offer a lower introductory price but more expensive options for more comprehensive reports.

Subscription and additional features: Many companies charge annual subscription fees for extended features. For example, genealogy databases that help you explore family connections might cost $10-20 monthly. Health monitoring features or expanded health reports may require additional payments. Some companies include these features with an initial higher purchase price, while others separate base testing from premium add-ons. Read the full pricing structure before purchasing—what appears to be a $99 test might become $120+ annually if you want to access all features.

Retesting and confirmation: If you want to confirm results or retest for a different purpose, most companies charge additional fees. Some companies offer family packages at a slight discount if multiple family members test together, which can be cost-effective if your household is interested in DNA testing.

Health-specific costs: If a health test reveals concerning findings, you might want genetic counseling to understand your results. Genetic counselors charge $100-300+ per session, though some insurance plans cover counseling related to genetic test results. This is a potential cost to consider if you're taking a health-focused test.

Practical Takeaway: Calculate the true cost of ownership by checking base price, annual subscription fees, and any additional features you want. Compare this total cost across companies, not just the advertised price.

What to Do With Your Results