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Reflex testing: when the lab tests your tumour automatically | CION Cancer Clinics
Reflex testing means the lab runs an extra test on your tumour automatically, because a written rule says every tumour of that type should have it. Most reflex tests guide treatment. A few, such as the MMR stain on bowel and womb cancers, can also hint at an inherited cause. This page explains how reflex testing works, what it does not do, and when a blood test follows. At CION Cancer Clinics in Hyderabad, our oncologists review your family history with you and guide you to the right genetic counselling and testing.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- What is reflex testing, and why was my tumour tested without asking?
- Which tests are commonly done by reflex?
- How does a reflex test move from the lab to you?
- The terms around reflex testing, in plain language
- Reflex tests and tests ordered on request
- What this page cannot tell you
- Four things patients assume about automatic tests
- Common questions about reflex testing
The short answer
What is reflex testing, and why was my tumour tested without asking?
Reflex testing means the laboratory runs an extra test on your tumour automatically, because a written rule says every tumour of that kind should have it. Nobody forgot to ask you. The rule exists so that no patient misses an important test because a busy doctor did not tick a box.
Why labs work this way
Some tumour results change treatment for almost everyone with that cancer. Others pick out the patients who may carry an inherited fault. When a test matters that often, waiting for each doctor to request it means some patients slip through. A standing rule catches them all, and it usually saves days, because the tissue is already on the pathologist's bench.
Where genetics comes in
Most reflex tests are about the tumour and its treatment. A few can also hint that a cancer may be inherited. The best known is the MMR stain on bowel and womb cancers, which can point towards Lynch syndrome. That is the moment a reflex test on the tumour becomes a question for the family.
A reflex test on the tumour is not a test of your inherited genes. Those are checked only on blood or saliva, and only with your consent.What gets tested
Which tests are commonly done by reflex?
The list varies from lab to lab and hospital to hospital. These are the ones you are most likely to meet.
The MMR stain on bowel and womb cancer
It checks four repair proteins in the tumour. A missing protein can point to Lynch syndrome, and it can also make immunotherapy an option. Many guidelines suggest it for every such cancer, at any age.
The follow-up test after MLH1 loss
If the stain shows MLH1 is missing, the lab may test the same tissue for methylation or a BRAF change. A positive result usually means the loss happened only in the tumour and is not inherited.
Treatment markers
These guide medicines and say nothing about inheritance. They are covered on our targeted therapy pages.
Examples
- Hormone receptors and HER2 in breast cancer
- EGFR and ALK in some lung cancers
- PD-L1 in several cancers
Tumour BRCA in ovarian cancer
Some centres test the tumour for BRCA faults as routine. A fault found there may be inherited, so a blood test is usually offered to confirm it.
Not sure whether this applies to you?
Ask an oncologistInside the lab
How does a reflex test move from the lab to you?
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The tissue arrives at the lab
Your biopsy or the tumour removed at surgery is processed into thin slices. The pathologist first confirms what kind of cancer it is.
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The rule is triggered
Once the cancer type is confirmed, the lab's written protocol decides which extra tests follow. No new sample is taken from you.
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The result joins your report
The reflex result appears on the pathology report, sometimes a few days after the main diagnosis. Your oncologist reads the two together.
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Your oncologist explains it
If the result changes treatment, you will hear about it at your next visit. If it hints at an inherited cause, you should be told that too, and offered a referral.
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Genetic counselling, if needed
A counsellor explains what an inherited cause would mean and asks for your consent before any blood test. You can take time to decide.
Words you may hear
The terms around reflex testing, in plain language
- Reflex test
- A test the lab runs automatically when a first result meets a set rule. No separate request is needed.
- Protocol
- The written rule that says which tests follow which diagnosis. Each hospital or lab keeps its own.
- Universal screening
- Testing every tumour of a given type, rather than only those in young patients or strong families. The MMR stain is the usual example.
- Somatic
- A fault found only in the tumour. It developed during life and cannot be passed on.
- Germline
- A fault present in every cell from birth. Only this kind can be passed to children.
- Mainstreaming
- When your oncologist, rather than a genetics clinic, offers the blood test for an inherited fault. A counsellor still sees anyone with a positive result.
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Side by side
Reflex tests and tests ordered on request
Reflex test on the tumour
Blood test for inherited faults
Runs automatically under the lab's rule
Runs only when you agree to it
Uses tissue already removed
Needs a fresh blood or saliva sample
Can hint at an inherited cause
Can confirm or rule out an inherited cause
Mainly guides treatment
Guides treatment and family testing
Being straight with you
What this page cannot tell you
It cannot tell you which reflex tests were run on your own tumour. Protocols differ between hospitals and labs, and in India many labs still run extra tests only when the oncologist asks. Your pathology report, or your oncologist, is the only reliable record. What any result means for you is a question for the doctor or counsellor who reads it with you.
It cannot say whether a reflex result is inherited
A tumour result can raise the question. It cannot settle it. Only a blood test, with counselling before and after, can do that, and that test is always your choice.
Who this does not apply to
For most people, reflex tests are about treatment alone and raise no family question. If your reflex results are normal and your family history is quiet, there is usually nothing further to do on the genetics side. Most people reading this will not need a blood test.
If you are unsure whether a reflex test was done, ask for a copy of your full pathology report. You are entitled to it.Commonly believed
Four things patients assume about automatic tests
"They tested my genes without my permission."
A reflex test looks at the tumour, which was removed to diagnose your cancer. It does not test your inherited genes. That needs a separate blood test, and it needs your consent.
"An automatic test must mean the doctor suspected something."
Reflex tests run on every tumour of a given type. The rule exists precisely so that nobody is singled out. Being tested says nothing about how worried anyone was.
"If the reflex test found something, I have an inherited condition."
An abnormal reflex result is a reason to look further. Many abnormal results turn out to be changes that happened only in the tumour and cannot be passed on.
"If no reflex test was done, the lab made a mistake."
Not every lab runs the same rules, and not every test applies to every cancer. If you think a test was missed, your oncologist can usually request it on the stored tissue.
Questions we are asked
Common questions about reflex testing
Do I have to consent to a reflex test?
Reflex tests on the tumour are normally covered by the consent you gave for diagnosis. Testing your inherited genes on blood is different and always needs your separate agreement. If you are uncomfortable with any test, say so to your oncologist before the tissue is sent.
Will I be charged for a reflex test?
It depends on the hospital and the lab. Some include it in the pathology fee, others bill it separately. Ask the billing desk before surgery, and check whether your insurance or a scheme such as Aarogyasri covers it.
Can I refuse a reflex test?
You can raise it with your oncologist. Bear in mind that some reflex results directly shape treatment, so refusing may leave your doctor without information they need. A conversation about why the test is done usually settles the worry.
Why did the reflex result arrive after the main report?
The lab has to confirm the cancer type before the rule can trigger. The extra stain or test is then run on the same tissue. This is normal, and the gap is usually short.
My reflex MMR stain was abnormal. Do I have Lynch syndrome?
Not necessarily. Many abnormal stains are explained by a change that happened only in the tumour. The next step is usually a further tumour test or a genetics referral. Only a blood test can confirm Lynch syndrome.
Can a reflex test be done on an old tissue block?
Often, yes. Hospitals store tissue blocks after surgery, and your oncologist can ask the lab to run a test that was not done at the time. This can also help families where the relative who had cancer has died.
Will my family be told about a reflex result?
Not by the lab. Your result is yours. If a blood test later confirms an inherited fault, your counsellor will help you decide how to tell relatives and can give you a family letter to share with them.
Who can explain my reflex results?
Your oncologist first, since they asked for the diagnosis. If a result hints at an inherited cause, ask for a genetic counsellor. Call the CION helpline if you are unsure who to approach, and someone will point you to the right clinic.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
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Sources
- National Cancer Institute — Biomarker Testing for Cancer Treatment
- GeneReviews (NCBI) — Lynch Syndrome
- NICE — Molecular testing strategies for Lynch syndrome in people with colorectal cancer (DG27)
- MedlinePlus Genetics — What is informed consent?
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
MMR staining as a route into Lynch testingThe reflex test most likely to raise a family questionWhen a tumour result triggers a germline testWhich tumour findings lead to a blood testWho orders which testOncologist, pathologist or geneticist, and who does whatGetting the order of tests rightWhy the sequence of tests matters
Talk to us
Not sure what a reflex result on your report means?
Tell us what the pathology report says. We will explain whether it raises a family question and arrange a genetics referral if it does. One helpline serves every CION centre.