In short
A family history changes what should be tested and when, and in some cases it changes the diagnosis entirely.
- Familial hypercholesterolaemia affects about 1 in 300 people. Risk calculators do not apply to it at all.
- Early heart disease in a parent or sibling is a risk enhancer, so it shifts the decision even where the calculator ignores it.
- First degree relatives of anyone with familial hypercholesterolaemia should be checked from age two.
Untreated, the condition brought heart disease by 60 to 52 per cent of male and 32 per cent of female relatives. Treated, life expectancy is now close to normal.
Condition Overview
What does a family history actually change?
Three things. It can move you up a risk category, it can lower the age at which testing starts, and in a few conditions it points to a specific inherited diagnosis with its own treatment.
The one that gets missed: familial hypercholesterolaemia
This is the most common single gene disorder in humans, affecting roughly 1 in 300 people. It is underdiagnosed almost everywhere.
Two large meta analyses, one of over seven million people and one of nearly eleven million, both put the prevalence at about 1 in 312. Among people with established cardiovascular disease it is 18 times more common, and among those with early heart disease, 21 times.
When should it be suspected?
Any one of these is enough to consider it.
- Early cardiovascular disease in you
- A family history of familial hypercholesterolaemia
- LDL cholesterol of 190 mg/dL or above
- Cholesterol deposits: thickened Achilles tendons or the back of the hands, yellow plaques on the eyelids, or a grey ring around the cornea before the age of 50
Why do calculators not work here?
Because they were built on general populations. Someone with familial hypercholesterolaemia has had a very high LDL since birth, so the total exposure is decades longer than the same LDL measured at 45.
In one study of 1386 people with LDL at or above 190, those without a causative variant had six times the risk of coronary disease, and those with one had 22 times the risk. Same cholesterol number, very different meaning.
What about family history without an inherited lipid disorder?
It still counts, as a risk enhancer. It does not change the calculated number, but it changes how that number is read, particularly at borderline and intermediate risk.
A calcium score is often the most useful next step there, because it measures what has actually happened in your arteries rather than what your family suggests might.
Does the outlook change with treatment?
Substantially. In Danish registry data from 1978 to 2021, the mean age at which people with familial hypercholesterolaemia were diagnosed with coronary disease rose from 49 to 61, and the mean age at death rose from 50 to 78.
By 2021 the age at death was comparable to people without the condition. This is one of the clearest examples in medicine of a diagnosis being worth making.
When to See a Doctor
- A parent or sibling had a heart attack, stroke or bypass before about 55 in men or 65 in women
- A close relative has been told they have familial hypercholesterolaemia or very high cholesterol
- There is early type 2 diabetes, or several relatives with it
- A pattern of cancer in the family that started young or affected several relatives
- You want to know which of your family history actually changes your own plan
- LDL cholesterol of 190 mg/dL or above, which needs assessment for an inherited cause rather than lifestyle advice
- Thickened Achilles tendons, yellow plaques on the eyelids, or a corneal ring under 50
- Chest pain or breathlessness on exertion, at any age, with a strong family history
How Dr. Felix Assesses This
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1
The family history, taken properly
Which relative, which condition, and at what age. Age at onset is the part that matters and the part usually left out. Cholesterol levels in relatives, especially measured in childhood, support the picture.
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2
Examination for the physical signs
Tendon deposits on the Achilles and back of the hands, eyelid plaques, and corneal arcus. Tendon deposits eventually appear in about 75 per cent of people with heterozygous familial hypercholesterolaemia, though earlier treatment is making them rarer.
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3
The right bloods
A fasting lipid profile. Where LDL is 190 or above, secondary causes are excluded as well: thyroid, kidney, liver and glucose. Lipoprotein(a) is included, because a high level alongside familial hypercholesterolaemia raises risk further.
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4
A diagnosis and a plan for the family
Diagnosis is usually made on clinical criteria, not genetics. Where a diagnosis is made, first degree relatives from age two onward should be checked too.
Treatment Options
Precision Medicine Program
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Longevity Consultation
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Personalized Longevity Plan
What actually makes a plan personal? Not a longer panel. The four inputs that change the plan are your calculated…
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Why Early Treatment Can Matter
Why does the age of diagnosis matter so much?
Because the damage is cumulative. Coronary calcification has been found in people with heterozygous familial hypercholesterolaemia as young as 11 to 23 years old.
Every year of untreated exposure adds to the total. That is why treatment started earlier is worth so much more than the same treatment started later.
Is genetic testing needed?
Usually not. The diagnosis is normally made on clinical criteria, and the genetic result rarely changes what is done next.
It is useful in two situations: when the clinical picture is genuinely unclear, and when identifying the specific variant would let relatives be screened for exactly that. A negative test does not rule the condition out, since up to half of people meeting clinical criteria have no identifiable variant.
What is done for cardiovascular assessment?
- A baseline ECG at the first visit, mainly as a reference point for later
- An exercise test where there are symptoms, ECG changes, strenuous work or sport over 35, or a planned pregnancy
- A calcium score over 40, to set the treatment intensity and to make the risk concrete
What should relatives do?
Everyone aged two or over with a first degree relative who has familial hypercholesterolaemia should be assessed: history, examination and a lipid panel. Where the family variant is known, targeted testing of relatives is appropriate.
This is called cascade screening, and it is the single most efficient piece of preventive medicine in this area.
Why Early Treatment Can Matter
Why does the age of diagnosis matter so much?
Because the damage is cumulative. Coronary calcification has been found in people with heterozygous familial hypercholesterolaemia as young as 11 to 23 years old.
Every year of untreated exposure adds to the total. That is why treatment started earlier is worth so much more than the same treatment started later.
Is genetic testing needed?
Usually not. The diagnosis is normally made on clinical criteria, and the genetic result rarely changes what is done next.
It is useful in two situations: when the clinical picture is genuinely unclear, and when identifying the specific variant would let relatives be screened for exactly that. A negative test does not rule the condition out, since up to half of people meeting clinical criteria have no identifiable variant.
What is done for cardiovascular assessment?
- A baseline ECG at the first visit, mainly as a reference point for later
- An exercise test where there are symptoms, ECG changes, strenuous work or sport over 35, or a planned pregnancy
- A calcium score over 40, to set the treatment intensity and to make the risk concrete
What should relatives do?
Everyone aged two or over with a first degree relative who has familial hypercholesterolaemia should be assessed: history, examination and a lipid panel. Where the family variant is known, targeted testing of relatives is appropriate.
This is called cascade screening, and it is the single most efficient piece of preventive medicine in this area.
What treatment has achieved
Mean age at coronary diagnosis rose from 49 to 61 and mean age at death from 50 to 78 between 1978 and 2021 in Danish registry data.
What untreated looks like
In a 1974 study, coronary disease by age 60 affected 52 per cent of male and 32 per cent of female affected relatives, against 13 and 9 per cent in unaffected ones.
One test, whole family
A lipid panel and an examination. Where a diagnosis is made, first degree relatives can be checked from age two.
Cost & Consultation Investment
The consultation and the lipid panel are quoted before anything is ordered, and both are ordinary tests rather than a specialist package. Genetic testing is not routine and is only suggested where the clinical diagnosis is unclear or where identifying a variant would let relatives be screened. Where it is suggested, the cost and its limits are explained first, including that a negative result does not rule the condition out.
Frequently Asked Questions
As a working rule, before about 55 in a male relative and 65 in a female one. What matters most is the age at which it happened, which is why that is the detail worth finding out.
Not necessarily. About 7 per cent of people have LDL above 190, and most do not meet the criteria or carry a causative variant. But the combination of high LDL and a variant raises coronary risk far more than the number alone.
Usually no. The diagnosis is made on clinical criteria and genetics rarely changes management. It helps when the picture is unclear, or to enable targeted screening of relatives.
Not yet for routine use. They are not standardised and are not ready for clinical application in cholesterol. For predicting coronary events, a calcium score outperformed polygenic scores in two large population studies.
If you have familial hypercholesterolaemia, yes. First degree relatives from age two should be evaluated, because coronary calcification has been found in affected people in their teens and early twenties.
It changes which screening is appropriate and when it starts. The principle is the same: age at onset and the number of affected relatives decide whether it moves the plan.
You cannot change the history, but you can change almost everything it acts on. Blood pressure, LDL, smoking and glucose are all modifiable, and the earlier they are addressed the more the years of exposure are reduced.
Evidence
Where this information comes from
Every figure on this page is taken from the sources below. All of them are free to read, so you can check them yourself.
- Cardiovascular diseases
- Cardiovascular disease: risk assessment and reduction
- Hypertension in adults: diagnosis and management
This page is general medical information and does not replace a personal consultation. Trial results are averages across large groups, not a prediction for any one person.