The short answer
Genetic counseling before any cancer diagnosis is about mapping risk and deciding whether testing would tell you anything useful. Most of the first appointment is spent building a three-generation family history. Choosing not to test is a legitimate outcome.
A genetic counselor builds a three-generation family history — organ of origin, age at diagnosis, and ancestry — before any test is ordered.
Where possible, testing a relative who has had cancer first is more informative than testing an unaffected person.
You can be tested on your own, without any relative's participation or permission, if no affected relative is available.
Pre-test counseling should cover which genes are on the panel, what each possible result means, cost, and written informed consent.
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The full explanation.
What a genetic counselor actually does
A genetic counselor is a healthcare professional trained in both medical genetics and counseling. Seeing one before any cancer has developed is about two things. One is mapping your risk. The other is deciding whether a test would tell you anything useful. It is not about receiving bad news.
Most of a first appointment goes on your family history. The counselor works through three generations on both sides. Who had cancer? Which organ did it start in? At what age? Did anyone have more than one primary cancer? Ancestry is recorded too, because some populations carry founder variants. About 2% of people of Ashkenazi Jewish descent carry one of three specific BRCA variants. In the general population the figure is 0.2% to 0.3%.
From that map, the counselor works out whether the pattern looks hereditary. Then comes the second question: is there a test that would change what you do next?
When it is worth going before anything has happened
People are referred, or refer themselves, for reasons like these:
- a variant already found in a relative
- cancer diagnosed unusually young in the family, especially under 50
- the same cancer in several close relatives on the same side
- one relative with two or more separate primary cancers
- rare patterns such as male breast cancer, ovarian cancer, or an unusual tumor type
- ancestry linked to founder variants
You do not need a doctor to tell you your history is worrying enough. Bring what you know. Even an incomplete picture is enough to start.
Testing an affected relative first, where possible
Has someone in your family had cancer? If they are willing and able to be tested, testing them first is usually more informative. If a specific variant turns up in them, you can then be tested for that one change. That gives a clear yes or no.
If you are tested first and nothing is found, the result is harder to read. It cannot tell you whether your family carries something the panel did not cover. This is called an uninformative negative. It is a common source of false comfort.
Sometimes no affected relative is available. They may have died, or declined, or contact may have been lost. Testing can still go ahead. You can be tested on your own, without any relative's help or permission. Your counselor will read the result with that limit in mind.
What the appointment covers before you decide
Pre-test counseling is meant to be a decision point, not a formality. It should cover which genes the panel includes and which it leaves out. It should cover what a positive, negative or uncertain result would each mean for your screening. It should cover what each would mean for your children and siblings. It should cover cost and insurance coverage. And it should end with written informed consent.
It should also cover the legal picture. GINA stops health insurers and most employers from using your genetic information. It does not cover life insurance, disability insurance or long-term care insurance. In most states those insurers may still ask about results and act on them. Planning to buy or increase any of those policies? Then have that conversation before testing, not after.
Deciding not to test
Choosing not to test is a legitimate outcome of genetic counseling. Some people go through the whole assessment, learn where they stand, and decide a result would not change anything they are willing to do.
Even then the visit is rarely wasted. A documented family history can qualify you for earlier or closer screening whether or not you test. Management often follows the family history rather than the test result. The door also stays open. People often come back years later when things change, such as before starting a family.
Finding one
Genetic counselors work in cancer centers and hospital genetics services. More and more work by telehealth, which has widened access a lot. The National Society of Genetic Counselors keeps a public directory you can search by specialty and location.
Direct-to-consumer kits are not a substitute. The only consumer BRCA test authorized in the US checks three variants. It misses about 80% of harmful BRCA variants.
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Common questions
Do I need a cancer diagnosis to see a genetic counselor?
No. Many people are seen precisely because they have not been diagnosed and want to know where they stand. Common reasons include a variant already found in a relative, cancer diagnosed young in the family, the same cancer in several close relatives on one side, or ancestry linked to founder variants.
What if I do not know much about my family history?
Bring what you have. Counselors work with incomplete histories routinely, including for people who were adopted or estranged from one side of the family. Age at diagnosis and which organ the cancer started in are the two most useful facts if you can only find a couple.
Should my mother be tested before me?
If a relative has had cancer and is willing and able to be tested, testing them first is usually more informative. If a specific variant is found in them, you can then be tested for that one change and get a clear yes or no. If that is not possible, you can still be tested yourself.
Will testing affect my insurance?
GINA prevents health insurers and employers with 15 or more staff from using genetic information. It does not cover life, disability, or long-term care insurance, and in most states those insurers may still ask. If you were planning to buy or increase any of those policies, raise it before testing.
Can I use a home DNA kit instead?
It is not a substitute. The only consumer BRCA test authorized in the US checks three specific variants and misses about 80% of harmful BRCA variants, so a reassuring result can be badly misleading. Clinical panels are far broader and come with interpretation.
Questions to ask your doctor
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Written by: Cancer ExplainedSources last checked: 2026-07-30 what this meansLast updated: 2026-08-10Next planned review: 2027-07-30
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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