Health condition
Clonal haematopoiesis (CHIP)
Clonal haematopoiesis of indeterminate potential (CHIP) means a blood stem cell carrying a cancer-associated mutation has expanded, without any blood disease being present; it is common with age and slightly raises both blood cancer and cardiovascular risk.
Why trust this guide
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Editorial team
Written by our editorial team from the UK sources listed on each page.
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Sourced from guidance
Checked against current NHS and UK specialist society guidance at the time of review.
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Current for 2026
Reviewed on 2026-09-27 with the next review scheduled for 2027-09-27.
Key facts
The essentials at a glance.
The symptoms to recognise, when to seek help, which specialist to see, and what treatment usually involves.
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Found in a substantial minority of people over 65 - usually via incidental genetic testing
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Progression to blood cancer is uncommon: on the order of 1% per year
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CHIP independently increases cardiovascular risk, which is actively modifiable
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Most people need reassurance, risk-factor management and simple monitoring, not treatment
Understanding the condition
What it is and what happens next.
What causes it, how it is diagnosed, and the treatment routes available in the UK.
What it is and how it feels
As we age, blood stem cells accumulate mutations, and occasionally one carrying a change in genes such as DNMT3A, TET2 or ASXL1 out-competes its neighbours. Detected on sequencing without abnormal counts, this is CHIP - a state, not a disease. Most carriers are unaware and remain well; the finding surfaces increasingly through tumour testing, research studies and consumer genomics, generating understandable anxiety.
Diagnosis and treatment routes
Sensible care follows the evidence in two directions. Haematologically, an annual blood count and awareness of warning changes suffice for most, with risk models identifying the minority meriting closer follow-up. Cardiovascularly, CHIP roughly doubles baseline risk through inflammatory mechanisms, so blood pressure, lipids, smoking and diabetes deserve genuinely aggressive attention - the part of the finding you can act on today. In many parts of the UK, routine NHS referrals for this kind of problem can take months, whereas an initial appointment with a private consultant is typically available within around two weeks.
Seeing a specialist
Who to see, and how quickly you can be seen.
The specialist for this condition is usually a consultant haematologist. Your GP can refer you on the NHS, or you can arrange a private consultation directly.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them - and seek urgent care for any of the emergency symptoms described above.
Frequently asked
Common questions about Clonal haematopoiesis (CHIP).
Quick, plain-English answers to what people ask us most.
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What is clonal haematopoiesis (CHIP)?
Clonal haematopoiesis of indeterminate potential (CHIP) is a condition in which a specific population of blood-forming stem cells, carrying an acquired genetic mutation associated with blood cancers, expands to make up a detectable proportion of a person's blood cells, without any accompanying blood count abnormalities or other features of a blood disorder. It becomes increasingly common with age and is usually found incidentally through genetic testing done for another reason. Most people with CHIP never develop a blood cancer.
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What causes CHIP?
It results from acquired genetic mutations occurring in blood-forming stem cells over a person's lifetime, which can give that cell and its descendants (a 'clone') a slight growth advantage over other blood-forming cells. It becomes progressively more common with increasing age, and by older age, a significant proportion of people have some degree of clonal haematopoiesis detectable if specifically tested for. It is generally considered part of the normal ageing process of the blood-forming system for most people, rather than a disease in itself.
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Is CHIP dangerous?
For most people, CHIP itself doesn't cause direct health problems, but it is associated with a modestly increased long-term risk of developing a blood cancer, and interestingly, has also been linked to a slightly increased risk of cardiovascular disease, through mechanisms not yet fully understood. The absolute risk for any individual remains relatively low, and most people with CHIP never go on to develop a related blood cancer. This is an active area of ongoing medical research to better understand these associations and their clinical significance.
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Does CHIP need treatment?
No specific treatment is given for CHIP itself, since it does not represent an active disease requiring treatment. Management typically focuses on periodic monitoring, particularly if specific higher-risk mutations are identified, and attention to general cardiovascular risk factors given the recognised association. Your doctor can advise on an appropriate monitoring plan based on your specific findings.
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How was CHIP found in my case, and what should I do?
CHIP is often discovered incidentally through genetic sequencing performed for another reason, such as as part of cancer treatment planning or general health screening using newer, more comprehensive genetic tests. If you've been told you have CHIP, discussing the specific findings and any recommended monitoring with a haematologist can help put the finding into context for your individual situation. This is generally a finding to be aware of and monitor rather than something requiring immediate concern or intervention.
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When should I see a specialist?
If you've been told you have CHIP, particularly with higher-risk features identified on testing, a haematology consultation can provide a clearer, individualised explanation of the significance and any recommended monitoring. A private haematology consultation is typically available within about 2 weeks for this kind of specialist explanation and reassurance.