Family History of Heart Disease: What to Do

Why your family history matters

A family history of heart disease, especially a parent or sibling affected at a young age, is one of the strongest clues you can get about your own risk, roughly doubling it in long-term studies. Tests can measure most of the inherited pieces, and treatment can address most of them.

If your father had a heart attack in his 40s or 50s, you probably remember it. Maybe you were a kid. Maybe you're now close to the age he was. That memory sticks, so act on it.

What counts as a premature family history?

A premature family history means heart disease in a parent, brother, or sister at a younger-than-usual age: before 55 in men and before 65 in women. When doctors ask about family history, they mean atherosclerotic cardiovascular disease (plaque-related heart disease, including heart attack, stroke, stents, or bypass surgery) in a first-degree relative at a younger-than-usual age:

• Father or brother: before age 55
• Mother or sister: before age 65

These are the cutoffs used by US cholesterol guidelines, including the 2026 ACC/AHA dyslipidemia guideline, which lists premature family history as a risk-enhancing factor.

Second-degree relatives (grandparents, aunts, uncles) count for less on their own. But several affected relatives on the same side of the family, or a relative with a heart attack in their 30s or 40s, is worth telling your care team about.

How much does family history raise your risk?

A parent with premature heart disease roughly doubles your risk, even after accounting for your own cholesterol and blood pressure. The best-known data come from the Framingham Heart Study, which followed parents and their adult children for decades. People with at least one parent who had premature heart disease had about 2 times the risk of a cardiovascular event over 8 years in men, and about 1.7 times in women, even after accounting for cholesterol, blood pressure, smoking, and diabetes.

Siblings matter too. A follow-up Framingham analysis found that having a brother or sister with cardiovascular disease raised risk by about 45%, after adjusting for other risk factors.

Family history adds risk beyond the standard risk factors, so a routine checkup may miss some of the inherited risk.

Why heart disease runs in families

Heart disease runs in families through shared genes, such as familial hypercholesterolemia and high Lp(a), and through shared habits. A few inherited factors explain a lot of early heart disease:

• Familial hypercholesterolemia (FH): a gene change that keeps LDL cholesterol (LDL-C) very high from birth. It affects roughly 1 in 250 to 1 in 311 people. See our FH guide.
• High lipoprotein(a), or Lp(a): an inherited cholesterol particle that about 1 in 5 people have at elevated levels. Standard cholesterol panels leave it out. See our Lp(a) guide.
• Many smaller gene variants that together nudge LDL, blood pressure, or blood sugar higher.
• Shared habits and environment: what the family ate, whether people smoked, how active everyone was.

Our guide on whether high cholesterol is genetic goes deeper on the genetics.

Which tests to ask for

If heart disease runs in your family, ask for a standard lipid panel, ApoB, and Lp(a), plus blood pressure, A1c, and kidney function; for many adults over 40, a coronary calcium score adds a direct look at plaque. What each one tells you:

ApoB is a single protein found on each LDL particle and other particles that cause plaque. It measures how many of those particles are in your blood. Read more in what ApoB is, or see how we order advanced lipid testing.

Lp(a) only needs to be tested once because it barely changes over your life. The 2026 guideline treats 125 nmol/L (50 mg/dL) or higher as a risk-enhancing factor.

A coronary artery calcium (CAC) score is a quick, low-dose CT scan that looks for calcified plaque in the heart arteries. The 2026 guideline supports it for men 40 and older and women 45 and older whose 10-year risk is borderline or intermediate, and recommends starting cholesterol-lowering treatment when the score shows calcium. See our coronary calcium score guide.

How risk calculators treat family history

Most 10-year risk calculators leave family history out, so guidelines treat it as a separate reason to lean toward treatment. The PREVENT equations, the 10-year risk calculator now used in US guidelines, don't ask about family history at all. They use age, sex, cholesterol, blood pressure, diabetes, smoking, kidney function, and a few optional measures.

So a healthy 45-year-old man whose father had a heart attack at 50 can get a reassuringly "low" 10-year score. The score reflects only the factors it was built around, and family history isn't one of them.

Guidelines handle this by treating premature family history as a risk-enhancing factor: a reason to lean toward treatment when the calculator puts you in a gray zone. Elevated Lp(a), high ApoB, and a positive calcium score play the same role.

Your action plan

If you are in your 40s and a parent had early heart disease, start with this plan:

1. Write down the facts. Who, what happened, and at what age.
2. Get the full blood workup: lipid panel, ApoB, Lp(a), A1c, and kidney function.
3. Ask whether a calcium score makes sense for you, especially if you are over 40.
4. Set a target. Your LDL and ApoB goals depend on your total risk. People with a strong family history, high Lp(a), or any coronary calcium often benefit from lower goals than the "normal" lab range suggests.
5. Keep the habits that work: regular exercise, a mostly plant-forward diet, good sleep, no smoking.
6. Treat what you find. If LDL or ApoB is above target, medication is the most reliable way to lower it, and you have options beyond statins. See alternatives to statins.
7. Recheck. Labs every few months after a change tell you whether the plan is working.
8. Tell your siblings and kids. If you find FH or high Lp(a), they may have it too. If a gene change is found, relatives can be tested for that exact change.

Every plan leaves some risk. Knowing your own numbers and acting on them gives you something concrete to do about a family pattern.

How Preval Health helps

Family history brings many people to Preval Health. A board-certified preventive cardiologist wrote our treatment protocols, and licensed clinicians through our partner telehealth network deliver the care.

The protocol starts with the tests that matter for family history (lipid panel, ApoB, and Lp(a)), sets clear LDL and ApoB targets based on your full risk picture, and builds a prescription plan to reach them, from statins through PCSK9 inhibitors when needed. Labs are repeated every quarter so you can see progress. Preval runs as a cash practice: $99 a month for care, with medicines at cash prices.