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Genetics Explained · Reviewed by CION Oncologists · NABH Accredited
Genetic Testing for Lynch Syndrome — What Actually Happens
Genetic testing sounds more dramatic than it is. In practice it is a conversation, a blood sample, and a wait — and for most women who reach this stage, a reassuring result. What matters is understanding the sequence, because the tumour test and the blood test answer different questions and are frequently confused. The tumour test asks what is happening in the cancer. The blood test asks what you were born with. Only the second can diagnose Lynch syndrome, only it has implications for your children, and it is arranged through counselling rather than ordered like a routine investigation.
- Two different tests — one looks at the tumour, one looks at you — they answer different questions
- Counselling comes first — the conversation before the blood test, not after the result
- It is a blood or saliva sample — the test itself is unremarkable; the preparation is the substance
- Three possible answers — positive, negative, or uncertain — and the third is common
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The Process, in Order
Five stages. Most women reading this are already past the first.
- Tumour testing. Done routinely on every endometrial cancer. Mismatch repair immunohistochemistry, with MLH1 methylation testing added if MLH1 protein is missing. This is a screen, not a diagnosis. See MMR and MSI testing.
- Referral for genetic counselling. Triggered by the tumour result, by your age at diagnosis, or by your family history. This is where the decision about testing is actually made. See what genetic counselling involves.
- The counselling appointment. Family history taken properly from both sides, the possible results explained, the implications for relatives discussed, and consent taken. Longer than a normal appointment, and deliberately so.
- The sample. Blood in most cases, sometimes saliva. Unremarkable in itself — the substance of this process is either side of it.
- The result appointment. Results are given in person rather than by post or phone, because all three possible outcomes need explaining and two of them lead to decisions.
Timescales vary considerably between centres and depend on whether the analysis is done in-house or sent to a reference laboratory. Several weeks is typical; ask at your counselling appointment so you are not waiting without a reference point.
Did You Know? If an affected relative is still living, testing usually starts with her rather than with you — and this is counter-intuitive enough that families often resist it. The reason is straightforward. A negative result in someone who has never had cancer is difficult to interpret, because it does not distinguish between a family that carries no variant and a family whose variant simply has not been found yet. A result in a relative who has had the cancer is far more informative: if a variant is identified in her, everyone else can be tested for that specific change, and a negative result then genuinely means negative. Sources: NCCN Clinical Practice Guidelines in Oncology — Genetic/Familial High-Risk Assessment: Colorectal, Endometrial and Gastric; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma; American College of Medical Genetics and Genomics standards for interpretation of sequence variants.
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The Three Possible Results
Women prepare themselves for two. The third catches people off guard, and it is common enough that it should not.
| Result | What it means and what follows |
|---|---|
| Pathogenic variant found | Lynch syndrome is confirmed. You would be offered colonoscopy from a younger age, awareness of other associated cancers, and discussion of risk-reducing surgery once childbearing is complete. Your first-degree relatives can be tested for that specific variant. This is a clear result with a clear plan attached. |
| No variant detected | Reassuring, and worth understanding precisely. It means no pathogenic change was found in the genes tested. It does not entirely exclude an inherited cause, since a variant could lie somewhere not covered by the test, and if the family history is strongly suggestive that may still influence what surveillance is recommended. |
| Variant of uncertain significance | A change was found whose meaning is not yet known — not clearly harmful, not clearly harmless. It is not a diagnosis and should not be treated as one. Management continues to be based on your personal and family history, and relatives are not tested for it. Classifications are periodically revisited as evidence accumulates, and many are eventually reclassified as harmless. |
The uncertain result deserves emphasis, because it is where most avoidable distress occurs. A variant of uncertain significance is common, it is not a Lynch diagnosis, and it does not mean you have something that has not been named yet. Genetics services expect these results and know how to handle them — which is precisely why testing is done through a service rather than ordered in isolation.
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A conversation, a blood sample, and a result explained in person. We will go through what each outcome would mean before anything is decided.
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The Testing Is Simple. The Conversation Around It Is the Point.
Which is why counselling comes first — so you understand the possible answers before you have one.
Practical Questions Worth Asking
These come up in most counselling appointments and are easier asked than assumed.
“How long will the result take?”
Turnaround varies considerably depending on whether the analysis is performed in-house or sent to a reference laboratory, and arrangements differ between centres. Several weeks is typical. Ask specifically at the counselling appointment, so that you have a reference point rather than waiting indefinitely and assuming something has gone wrong.
“What will it cost, and is any of it covered?”
Genetic testing carries a real cost and coverage varies by scheme and by whether testing is being done for diagnostic purposes in someone already affected. Ask about the total cost including counselling, and about what your insurance or state scheme would meet, before proceeding rather than partway through. See genetic testing cost.
“Who else needs to know?”
A positive result has implications for relatives, and how that information reaches them is a genuine question rather than an afterthought. Genetics services are experienced at supporting this and can provide a family letter explaining the finding and what relatives should do. You are not expected to hold the conversation alone or unaided.
“Do I have to be tested?”
No. Declining is a legitimate choice and counselling is designed to help you reach a decision rather than to steer you to one. Some women decide the information would not change what they do; others want it precisely because it would. It is also a decision you can defer — the option remains open, and the tumour material stays available.
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Testing Relatives Is a Different and Simpler Process
Once a variant has been identified in one family member, testing everyone else becomes much more straightforward. The hard part of genetic testing is finding a variant in the first place; looking for one you already know about is comparatively simple.
- The test is targeted. Rather than examining whole genes for any possible change, the laboratory looks for one specific known variant. Faster, cheaper and definitive.
- The result is a clear yes or no. No uncertain results, because the change being looked for has already been classified. This is the one situation in this field where the answer is genuinely binary.
- A negative result means population risk. A relative who does not carry the family variant is not at increased risk and needs no additional surveillance — which is a substantial relief and a real benefit of the whole process.
- A positive result opens surveillance before any cancer exists. This is where the greatest benefit of the entire pathway lies: identifying someone healthy, and preventing a cancer rather than treating one. See Lynch syndrome and your family.
For what surveillance then involves, see surveillance with Lynch syndrome and risk-reducing hysterectomy.
Why Testing Belongs Inside a Service
Because a third of the possible answers is ambiguous, and that answer needs someone who deals with it routinely.
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Common questions
Genetic Testing for Lynch Syndrome — Frequently Asked Questions
What is the difference between the tumour test and the genetic test?
They answer different questions and are frequently confused. Mismatch repair testing is performed on the tumour tissue and asks whether the DNA repair system is working within that cancer. It is done on every endometrial cancer, and an abnormal result is common — most often because the tumour has silenced one of its own repair genes, an acquired change with no implications for your family. Germline genetic testing is performed on a blood or saliva sample and asks what you were born with, examining the mismatch repair genes in your normal cells. Only this second test can diagnose Lynch syndrome, and only it has implications for your children and relatives.
What does the testing actually involve?
Less than most people expect. There is a genetic counselling appointment first, which is longer than a normal consultation: your family history is taken properly from both sides, the possible results and their implications are explained, and consent is discussed. Then a sample is taken — blood in most cases, sometimes saliva. Then a wait, typically several weeks, though this varies depending on whether the analysis is done in-house or sent to a reference laboratory. Then a result appointment, given in person rather than by phone or post, because all three possible outcomes need explaining and two of them lead to decisions.
What is a "variant of uncertain significance"?
It means a change was found in one of the genes tested, but its clinical meaning is not yet established — it is not clearly harmful and not clearly harmless. This is a common outcome and it is the one women are least prepared for. Importantly, it is not a diagnosis of Lynch syndrome and should not be treated as one: management continues to be based on your personal and family history, and relatives are not tested for it. Classifications are periodically revisited as more evidence accumulates across laboratories worldwide, and a substantial proportion of these variants are eventually reclassified as harmless.
Why would my relative be tested before me?
Because a result in someone who has had the cancer is far more informative. If a relative who developed endometrial or bowel cancer is still living, testing her first makes sense: if a pathogenic variant is found in her, everyone else in the family can then be tested for that specific change, and a negative result genuinely means negative. By contrast, testing someone who has never had cancer first can produce a negative result that is hard to interpret, because it does not distinguish between a family carrying no variant and a family whose variant simply has not been found. Families often find this counter-intuitive, but it is the more informative order.
Do I have to have the test?
No. Declining is a legitimate choice, and genetic counselling exists to help you reach a decision rather than to steer you towards one. Some women conclude the information would not change what they do; others want it precisely because it would — bowel screening from a younger age is the largest practical benefit, and the implications for relatives are the other major consideration. It is also a decision you can defer rather than refuse permanently: the option remains open, and the tumour material stays available. If you are unsure, that is a reason to attend the counselling appointment rather than to avoid it.
Medical disclaimer: This page describes the process of genetic testing for Lynch syndrome in general terms and is reviewed by a CION oncologist, following current NCCN guidance on genetic and familial high-risk assessment. Arrangements, turnaround times and costs vary between centres and testing may be performed in-house or sent to a reference laboratory. It is general health information rather than advice about your own case; decisions about testing should be made through genetic counselling.