Overview
Genetic testing examines genes, chromosomes, or proteins to look for inherited changes linked to health conditions. Different tests are used for different purposes, such as diagnosing a condition, checking whether a person carries a gene change, estimating the chance of developing certain diseases, or guiding some treatment decisions. Testing may be done before birth, in childhood, or in adulthood depending on the situation.
Causes and Risk Factors
A healthcare professional may suggest genetic testing when there is a personal or family history of an inherited condition, repeated unexplained health problems, certain cancers in a family, or concerns during pregnancy. Some people seek testing because of ethnicity or ancestry linked with higher chances of certain inherited conditions. Testing may also be considered when a medicine may work differently because of inherited differences.
Who Is Affected
People of any age and background may have genetic testing. It is commonly used for people with symptoms that suggest an inherited condition, relatives of someone with a known genetic change, couples planning a pregnancy, pregnant people, and some people with cancer. Newborn screening programs in many countries also test babies for certain inherited conditions soon after birth.
Prevention
Genetic testing itself does not prevent disease, but the information may help people make informed health and family-planning decisions. In some situations, learning about inherited risk can support earlier monitoring or risk-reduction plans recommended by a clinician. Because test results can affect relatives as well as the person tested, discussing benefits, limits, and privacy concerns ahead of time is important.
Diagnosis and Tests
Testing can include single-gene tests, gene panels, chromosome tests, prenatal tests, newborn screening, and pharmacogenomic tests. Samples are often taken from blood, saliva, or a cheek swab, and sometimes from tissue or pregnancy-related samples. Results may be positive, negative, likely benign, or uncertain, and some findings do not have a clear meaning yet. Genetic counseling can help explain what the test can and cannot show, possible effects on family members, and whether more testing is needed.
Living With It
Waiting for results or learning about inherited risk can bring stress, guilt, relief, or confusion. Some people worry about family planning, insurance rules in their country, privacy, or how to share results with relatives. Support from a genetic counselor, doctor, nurse, or patient support group can help people understand the result and next steps.
When to Seek Medical Care
Speak with a healthcare professional if you have a strong family history of inherited disease, early or unusual cancers in close relatives, repeated miscarriages, a child with developmental or unexplained health problems, or questions about testing before or during pregnancy. Medical advice is also important if you receive a direct-to-consumer genetic test result and are unsure what it means. Decisions based on genetic results should generally be confirmed and discussed with a qualified clinician.
Questions to Ask a Healthcare Professional
You may want to ask: What question is this test trying to answer? What kinds of results are possible, including uncertain findings? How could the result affect my care or my family members, and should I meet with a genetic counselor? You can also ask about privacy, costs, and whether another test might be more useful.