Genetic testing makes sense for people in specific medical or life situations, not as a blanket recommendation for everyone. The clearest candidates include people planning a pregnancy, those with a strong family history of certain cancers or heart conditions, children with unexplained developmental delays, and patients whose doctors need to choose the right medication. Outside of those scenarios, testing can still be useful, but the value depends heavily on what you’re looking for and what you plan to do with the results.
People Planning or Starting a Pregnancy
Carrier screening is one of the most common and well-established uses of genetic testing. You can carry a gene variant for a serious condition without having any symptoms yourself. If your partner carries a variant in the same gene, your child could be affected. The American College of Obstetricians and Gynecologists recommends that all women considering pregnancy or currently pregnant be offered screening for cystic fibrosis and spinal muscular atrophy, regardless of ethnicity or family history.
Some screening is guided by ancestry. If you have African, Mediterranean, Middle Eastern, Southeast Asian, or West Indian heritage, your provider will typically check for hemoglobin disorders like sickle cell disease or thalassemia. Carrier screening for conditions like Tay-Sachs disease is most relevant for people of Ashkenazi Jewish descent, though expanded panels that cover dozens of conditions at once are increasingly offered to everyone. Ideally, this testing happens before pregnancy so you have the most options if results are significant.
People With a Family Pattern of Cancer
A family history of cancer doesn’t automatically mean you need genetic testing, but certain patterns raise the odds that an inherited gene variant is involved. Red flags include multiple relatives on the same side of the family diagnosed with the same or related cancers, cancer diagnosed at an unusually young age (such as breast cancer before 50), a family member with more than one primary cancer, or rare cancers like male breast cancer or ovarian cancer at any age. If a relative has already tested positive for a variant in a gene like BRCA1 or BRCA2, testing becomes straightforward: you’re checking whether you inherited that specific variant.
The most informative approach is to test the person in your family most likely to carry the variant first, usually the one who had cancer. If their test comes back negative, the rest of the family generally doesn’t need testing for that condition. If it comes back positive, close relatives can then do targeted testing for that single variant, which is simpler and less expensive.
People With Inherited Heart Conditions
Genetic testing plays a growing role in cardiology, but the American Heart Association recommends it only for people who already have a confirmed or strongly suspected diagnosis of an inherited heart condition, or for family members of someone with a known disease-causing variant. Conditions where testing is most useful include hypertrophic cardiomyopathy (where the heart muscle thickens abnormally), dilated cardiomyopathy, and certain arrhythmia syndromes like long QT syndrome.
A detailed family history spanning at least three generations is the starting point. If that history reveals sudden unexplained deaths, heart failure in young relatives, or fainting spells, your cardiologist may recommend testing. For people who have survived a cardiac arrest, testing is recommended only when there’s clinical suspicion of a specific inherited condition. A positive result can guide treatment and, just as importantly, identify which family members need cardiac monitoring even if they feel fine.
Children With Developmental Delays
When a child has unexplained intellectual disability, autism, or significant developmental delays, genetic testing can often identify the cause. Chromosomal microarray analysis, a test that detects missing or extra stretches of DNA, finds a disease-causing genetic change in 15 to 20 percent of children with more severe disabilities. That rate climbs to 20 to 25 percent when the child also has unusual facial features, birth defects, or epilepsy. Among children with autism accompanied by intellectual disability and physical differences, the detection rate can reach 25 to 30 percent.
These numbers matter because a genetic diagnosis can end years of uncertainty for families. It can connect you to condition-specific support groups, clarify what to expect, guide therapy choices, and inform decisions about future pregnancies. Testing is most productive when a child has moderate to severe delays or when there are additional physical findings. For milder developmental concerns without other features, the yield is lower but still worth discussing with your pediatrician.
Patients Who Need Medication Guidance
Pharmacogenomic testing checks how your genes affect the way you process certain drugs. This is relevant when you’re about to start a medication with a known gene-drug interaction and your doctor wants to avoid a bad reaction or choose the right dose from the start. The most established example is warfarin, a blood thinner where genetic variants can dramatically change the dose you need. Medicare covers pharmacogenomic testing when the medication has a recognized gene-drug interaction supported by clinical guidelines and the result would directly change how your condition is managed.
Multigene panels for medication guidance typically cost $300 to $500 out of pocket. More comprehensive testing, like whole-exome sequencing, can run $1,000 to $2,000 or more. Insurance coverage varies widely, so checking with your plan before testing is worthwhile.
What Direct-to-Consumer Tests Can and Can’t Do
Companies like 23andMe offer FDA-authorized genetic health risk reports that you can order without a doctor. These cover a specific, limited set of conditions: hereditary hemochromatosis (iron overload), late-onset Alzheimer’s disease risk, Parkinson’s disease, celiac disease, a blood clotting condition called hereditary thrombophilia, and several others. The FDA also allows consumer carrier screening tests that check whether you carry variants you could pass to a child.
The key limitation is that these tests check only a handful of variants per condition. A negative result on a consumer test does not rule out the condition. The BRCA report from 23andMe, for instance, tests for just three variants most common in people of Ashkenazi Jewish descent. There are thousands of other BRCA variants that test won’t detect. If you have a strong family history of breast or ovarian cancer and your consumer test is negative, you still need clinical-grade testing through a genetics provider to get a meaningful answer.
Consumer tests are best thought of as a starting point for conversation, not a clinical tool. A positive result on any health risk report should be confirmed with a clinical test before making medical decisions.
Legal Protections to Know About
A common concern is whether genetic test results could be used against you by insurers or employers. The Genetic Information Nondiscrimination Act (GINA) prohibits health insurers from using genetic information to deny coverage, set premiums, or make underwriting decisions. It also bars employers from using genetic information in hiring, firing, or promotion decisions.
GINA does not, however, cover life insurance, long-term care insurance, or disability insurance. Companies offering those products can, in most states, ask about and use genetic test results. Some states have passed their own laws extending protections to these areas, but the patchwork is uneven. If you’re considering a large life insurance or long-term care policy, it may be worth securing that coverage before pursuing elective genetic testing.
How to Decide If Testing Is Right for You
The value of a genetic test depends on what question you’re trying to answer. Testing is most useful when a positive result would change what you or your doctor actually does: starting earlier cancer screenings, adjusting a medication, monitoring a child’s heart, or making informed reproductive choices. If the result wouldn’t change your next step, the test may create more anxiety than clarity.
A genetic counselor can help you sort through whether testing makes sense for your situation, which type of test to choose, and what the results could realistically tell you. Many genetic counseling services are now available by telehealth, and a session typically lasts 30 to 60 minutes. Your primary care doctor or specialist can also refer you if your personal or family history fits the patterns described above.