Interpreting Your Genetic Test Results
A genetic test report is not a verdict — it is a structured summary of what was sequenced and how each finding is currently classified. This guide explains what positive, negative, and uncertain results mean, why a result can change over time, and where genetic counseling fits in.
Understanding Your Report
Positive, negative, and uncertain are not three points on a single scale
Multi-gene panel testing compares the DNA sequence in your sample against the expected reference for each gene examined. Where a difference is found, the laboratory assigns it to a classification category using shared frameworks such as those published by the American College of Medical Genetics and Genomics. A report typically resolves to one of three outcomes.
A positive result means a pathogenic or likely-pathogenic variant — a change with established or strongly-supported links to disease risk — was identified. A negative result means no such variant was found in the genes tested. A variant of uncertain significance (VUS) means a difference was detected, but current evidence is insufficient to call it harmful or harmless. Reading these categories as "yes," "no," and "maybe" oversimplifies them: each carries specific, bounded meaning that depends on which genes were analyzed and what the laboratory could and could not detect.
What each result does — and does not — mean
The interpretation of any single result depends on context: your personal and family history, the genes on the panel, and the limits of the testing method. The distinctions below are educational and are not a substitute for a clinician's review of your individual report.
A positive result identifies elevated risk, not certainty of disease
A pathogenic variant in a hereditary cancer gene indicates an increased lifetime risk for the associated cancers — it does not mean cancer is present or inevitable. Penetrance (the chance a variant leads to disease) varies widely between genes and is shaped by other genetic and environmental factors. A positive result is most useful as information that informs screening and prevention discussions with a clinical team.
A negative result is bounded by what was tested
A negative result lowers the likelihood of an identifiable inherited cause within the genes examined, but it is not a guarantee of low risk. The panel may not include every relevant gene, some variants fall outside what current methods detect, and a strong family history can still warrant screening even when no variant is found. A negative result in a relative of someone with a known variant (a 'true negative') carries more definitive meaning than an uninformative negative in a person with no known family variant.
A VUS is a placeholder, not a finding to act on
A variant of uncertain significance reflects incomplete evidence, not hidden danger. Professional guidelines are explicit that medical management should not be based on a VUS. These variants are common — particularly in less-studied genes and in populations underrepresented in genetic databases — and most are eventually reclassified as benign as more data accumulates.
Results carry implications for relatives
Because hereditary variants are inherited, a positive result has meaning for biological family members, who may each carry the same variant. This is the basis for cascade testing — offering targeted testing to relatives for a specific known variant. A result is therefore both personal and familial, which is one reason interpretation is best handled within a counseling relationship.
Reclassification: how a result can be updated years later
A genetic classification is a snapshot of current scientific consensus, not a permanent label. As laboratories sequence more people, share data through registries and curated databases, and publish new functional studies, the evidence behind any given variant grows. When that evidence crosses a threshold, the laboratory may reclassify the variant.
The most common shift is a VUS being downgraded to benign — reassuring news that resolves earlier uncertainty. Less often, a variant is reclassified to pathogenic, which can change screening recommendations. This is precisely why longitudinal registries such as the multi-institutional panel-testing registry that this domain documents matter: aggregating outcomes across many tested individuals is what makes reclassification possible. Because of this, a report you received in the past may not reflect the current understanding of your variant, and periodically asking your testing laboratory or counselor whether a result has been updated is a reasonable step.
Frequently asked questions
Should I make a medical decision based on a variant of uncertain significance?
Professional guidelines advise against managing care based on a VUS. Because the evidence is incomplete and most uncertain variants are ultimately reclassified as benign, screening and prevention decisions are generally guided by your personal and family history rather than the VUS itself. A genetic counselor or clinician can explain how a specific VUS fits — or does not fit — into your overall risk picture.
Does a negative result mean I have no inherited cancer risk?
Not necessarily. A negative result means no reportable variant was found in the genes that were tested. Risk can still come from genes not on the panel, from variants outside the limits of the method, or from non-genetic factors. When there is a notable family history, clinicians often consider that history alongside the test result rather than relying on the result alone.
Why would my relatives need testing if I already have my result?
When a pathogenic variant is identified, biological relatives may carry the same variant. Cascade testing offers them targeted testing for that specific change, so each relative learns their own status rather than inheriting yours by assumption. Sharing a positive result within a family — supported by genetic counseling — is how relevant relatives can access informed screening discussions of their own.
Can my result really change after I receive it?
Yes. Variant classifications are updated as evidence accumulates. A variant called uncertain today may later be reclassified as benign or, less commonly, as pathogenic. Many laboratories will notify the ordering clinician when a reclassification occurs, but it can also be worth periodically checking whether your result has been updated.
Is this page medical advice?
No. This is educational reference material intended to help you understand the structure and language of a genetic test report. It cannot interpret your individual results, which depend on details only available to a clinician reviewing your specific report, history, and the panel used. Decisions about testing, screening, and care should be made with qualified genetic counseling and medical professionals.
Interpretation is a conversation, not a single line on a page
Genetic counselors are trained specifically to translate a laboratory report into context — explaining what a result means given your history, helping weigh the limits of the testing, and outlining what a positive, negative, or uncertain finding implies for both you and your family. They also coordinate cascade testing, guiding which relatives might benefit and how to approach those conversations.
Because the same report can mean different things for different people, the value of counseling lies in personalization: matching the science to your situation without overstating certainty or minimizing genuine risk. This educational hub is designed to prepare you for that conversation — to make the vocabulary familiar — not to replace it.
Bring your questions to the conversation
Understanding the categories on your report is a starting point. For interpretation tied to your own history, family, and the specific panel you received, work with a qualified genetic counselor or clinician. Reach out and we can help point you toward the right educational resources.