You can learn about your DNA through consumer testing kits that analyze a saliva sample at home or through clinical genetic tests ordered by a healthcare provider. Each option reveals different information, from ancestry and ethnic background to health risks and carrier status for inherited conditions. The path you choose depends on what you want to find out.
What DNA Tests Can Tell You
Consumer DNA tests fall into three broad categories. Ancestry tests trace where your ancestors likely came from, estimate your ethnic makeup, and connect you with genetic relatives who’ve also tested. Health tests estimate your genetic risk for conditions like celiac disease, Parkinson’s disease, and Alzheimer’s disease, and some check whether you carry gene variants linked to conditions like cystic fibrosis or sickle cell disease. A third category, sometimes called lifestyle or wellness testing, claims to offer DNA-based guidance on nutrition, fitness, sleep, skincare, and metabolism.
Some companies bundle all three categories into one kit. Others specialize. The health-related results tend to get the most attention, but they come with important limitations worth understanding before you order.
How the Testing Process Works
Most consumer DNA tests use a saliva sample you collect at home. You spit into a tube, seal it, and mail it to the company’s lab. Blood has long been the gold standard for extracting DNA, but saliva works well for the type of analysis consumer kits perform. The collection process is painless, doesn’t require a healthcare professional, and uses commercially available kits designed for self-collection.
Clinical genetic tests ordered through a doctor or genetic counselor may use either a blood draw or a saliva sample, depending on the test. Results from consumer kits typically arrive in three to eight weeks. Clinical tests vary more widely in turnaround time depending on what’s being analyzed.
SNP Genotyping vs. Whole Genome Sequencing
Consumer tests like those from 23andMe and AncestryDNA use a method called SNP genotyping. This looks at specific, pre-selected points in your DNA where people commonly differ from one another. A typical consumer chip reads roughly 450,000 to 700,000 of these points. That sounds like a lot, but your genome contains over 3 billion base pairs. Whole genome sequencing, by contrast, reads essentially everything, identifying upwards of 8 million variants. The vast majority of your genome goes unexamined by consumer genotyping.
This matters because consumer tests can only find what they’re designed to look for. If a health-relevant variant sits in a stretch of DNA the chip doesn’t cover, it won’t show up in your results.
What Health Results Actually Mean
When a consumer test reports your risk for a disease, it’s usually based on a polygenic risk score. This is a single number calculated by adding up the effects of many small genetic variants across your genome, each one contributing a tiny nudge toward higher or lower risk. The score places you somewhere on a spectrum relative to other people, not on a simple yes-or-no scale.
A higher polygenic risk score for a condition like type 2 diabetes doesn’t mean you’ll develop it. It means your genetic starting point tilts the odds somewhat. Environment, diet, exercise, and dozens of other factors also shape your actual risk. These scores are better at identifying people at the extreme ends of the risk curve than at making precise predictions for any single person.
Carrier status results work differently. Being a carrier means you have one copy of a gene variant that would cause a condition only if you had two copies. Carriers are typically healthy themselves, but if both parents carry the same variant, each child has a 25% chance of inheriting the condition. Carrier screening identifies this risk, but it doesn’t diagnose anything in you or your future children. It flags a possibility.
Why Consumer Tests Have Blind Spots
Consumer health tests can be misleadingly reassuring. The 23andMe breast cancer test, for instance, screens for just 3 variants in the BRCA1 and BRCA2 genes. More than 1,000 BRCA variants are associated with increased breast and ovarian cancer risk. A negative result on that test means those 3 specific variants weren’t found. It does not mean you’re free of BRCA-related risk. Someone with a different harmful variant would get a clean result and might incorrectly assume they’re in the clear.
On the other end, some clinical-grade consumer panels sequence dozens of genes at once, casting a wide net. The problem here is the opposite: they may identify a variant in a gene where medical guidelines for managing risk are still evolving. You could learn you carry something concerning without clear guidance on what to do about it. The American College of Medical Genetics and Genomics has identified 59 genes where returning results to patients is considered appropriate because actionable medical steps exist, but broader panels often go well beyond that list.
Consumer Testing vs. Clinical Testing
The key difference is clinical utility, meaning whether the result can directly guide medical decisions. A clinical genetic test ordered by a provider is selected for a specific reason, interpreted by professionals trained in genetics, and held to stricter laboratory standards. Consumer tests are designed for curiosity and general awareness.
If you have a family history of cancer, heart disease, or another condition with a known genetic component, a clinical test through your doctor will be far more thorough and reliable than a consumer kit. If you’re pregnant or planning a pregnancy, carrier screening through a healthcare provider uses broader panels and comes with professional interpretation. Consumer test results are generally not considered diagnostic and shouldn’t replace medical-grade testing when the stakes are high.
Getting More From Your Raw Data
After taking a consumer test, you can typically download your raw DNA data file from the testing company. This file contains your genotyping results in a format that third-party tools can analyze. Services like Genomelink, GEDmatch, and others accept uploads from AncestryDNA, 23andMe, and MyHeritage, offering additional trait reports, more granular ancestry breakdowns, and tools to find genetic relatives across different testing platforms.
Some third-party sites offer hundreds of trait analyses spanning food preferences, physical characteristics, personality tendencies, and more. The scientific reliability of these extended reports varies widely. Traits strongly influenced by many genes and environmental factors, like personality or intelligence, are harder to predict from DNA than simpler traits like earwax type or caffeine metabolism. Look for sites that link to the underlying research studies and provide reliability scores for each trait.
Privacy and Legal Protections
Once you hand over your DNA, you’re sharing the most personal biological information you have. The Genetic Information Nondiscrimination Act (GINA) makes it illegal for employers to discriminate based on genetic information in hiring, firing, pay, promotions, or any other employment decision. GINA also restricts employers from requesting or requiring genetic information. On the insurance side, the law prevents health insurers from using genetic data to deny coverage or set premiums.
GINA has a notable gap: it does not cover life insurance, disability insurance, or long-term care insurance. Companies in those markets can legally ask about and use genetic test results. This means learning about a genetic risk through testing could affect your ability to get certain types of insurance. Some people choose to secure these policies before testing for this reason.
Each testing company also has its own data-sharing policies. Some offer the option to contribute your anonymized data to research, and some share data with pharmaceutical partners. Read the consent forms carefully, and know that opting out of research participation is almost always available.
Working With a Genetic Counselor
If your results reveal something unexpected or concerning, a genetic counselor can help you make sense of it. These are professionals trained to interpret genetic data in the context of your personal and family health history. The National Society of Genetic Counselors maintains a directory of over 3,300 counselors across the U.S. and Canada, searchable by location or telehealth availability at findageneticcounselor.nsgc.org.
A genetic counselor can explain what a specific variant means for your health, whether confirmatory clinical testing is warranted, and what your options are if a result turns out to be medically significant. This is especially valuable for consumer test results, which are designed to be read without professional help but sometimes raise questions that need expert context.