If a parent, brother or sister had a heart attack, stent, bypass or stroke at a young age, a few tests add real information beyond a routine checkup. The short list is Lp(a) measured once, ApoB, the standard risk factors done properly, and for some people a coronary calcium score.
The aim is to find out what, if anything, you inherited, and whether plaque has already started. Most people with a family history do not need every heart test on offer. They need the right four or five, at the right age.
Key takeaways
- With an early family history, the tests that add the most are Lp(a) once, ApoB, the standard risk factors and sometimes a calcium score.
- You probably do not need every heart test available, just the right few at the right age.
- A calcium scan done too young is usually zero, and a zero is less reassuring with a strong family history.
- An untreated LDL of 190 mg/dL or higher is a reason to ask your doctor about familial hypercholesterolemia.
- When an inherited cause is found, it matters for close relatives, who can be tested step by step.
First, does your family history count as early?
US cholesterol guidance defines a premature family history as heart or vascular disease in a first-degree male relative before 55 or a first-degree female relative before 65.1 First-degree means a parent, sibling or child.
A grandparent who had a heart attack at 80 is not in this category. A father who had one at 52 is. Our article on family history of early heart disease covers how much it raises your own risk. This one is about which tests to have.
Lp(a): once in your life
Lipoprotein(a), written Lp(a), is a cholesterol-carrying particle whose level is largely inherited. It does not show on a standard cholesterol panel. The 2026 US dyslipidemia guideline recommends measuring it once in all adults, and a family history of early heart disease is one of the clearest reasons not to put it off.2
Family history and Lp(a) each carry their own information. In a study of more than 12,000 adults followed for 21 years, a family history of heart disease and a high Lp(a) were each independently linked to cardiovascular events, and people with both had the highest risk.3
A level of 125 nmol/L (50 mg/dL) or more is listed in US guidance as a risk enhancer. There is no approved medicine that specifically lowers Lp(a), so a high result is used to guide how firmly your other risk factors are managed. Our Lp(a) test guide has the details.
ApoB and the standard risk factors
ApoB counts the particles that carry cholesterol into the artery wall. It can be high when LDL cholesterol looks acceptable, which is one way families with "normal cholesterol" still end up with early heart disease.
A national lipid expert group concluded that ApoB reflects the plaque-causing particle burden more accurately than LDL cholesterol, and that when the two disagree, risk generally tracks ApoB. An ApoB of 130 mg/dL or higher is listed in US guidance as a risk enhancer. See our ApoB guide for how to read your number.
The standard checks still matter most, done properly:
- Blood pressure, measured more than once
- A fasting lipid panel
- Fasting glucose and A1c, and fasting insulin where insulin resistance is suspected
- Smoking history, weight and waist size
- hs-CRP as a marker of inflammation, which US guidance also counts as a risk enhancer at 2.0 mg/L or above
When imaging adds information
A coronary calcium score shows whether calcified plaque has actually formed. Timing matters, because a scan done too young is usually zero. A modeling study of more than 22,000 adults aged 30 to 50 estimated that a first scan becomes worthwhile at about 42 in men and 58 in women with no risk factors. A family history of heart disease was linked to calcium appearing roughly three to four years earlier.4
That puts a reasonable first scan around 40 for many men with a family history and in the mid 50s for many women, sooner if other risk factors are present. These are estimates from one study, not rules. The decision belongs with a clinician who knows your history.
Two cautions. A score of zero is reassuring, but US guidance treats it as less reassuring in people with a strong family history, as well as in people who smoke or have diabetes.2 And a carotid CIMT ultrasound adds less: US guidance does not recommend it for routine risk prediction.
Familial hypercholesterolemia and testing relatives
Familial hypercholesterolemia, or FH, is a specific inherited condition that causes very high LDL cholesterol from birth. It affects about 1 in 311 people worldwide and remains severely underdiagnosed.5
The main flag is an untreated LDL cholesterol of 190 mg/dL or higher, especially together with early heart disease in the family. Not everyone at that level has FH. In a large genetic study, fewer than 2% of people with LDL of 190 or above carried an FH gene variant.6 But those who did had about a 22-fold higher risk of coronary disease than people with LDL below 130 and no variant, compared with a 6-fold higher risk in people with the same high LDL and no variant.
If your LDL has ever been that high, raise FH with your doctor.
When an inherited cause is found, it matters to your family too. Cascade screening means testing close relatives step by step, starting with parents, siblings and children.
A 2026 expert consensus from the National Lipid Association recommends systematic cascade screening in families with FH. The same reasoning applies to Lp(a), because it is inherited too.
Choosing a Cardio Res-Q assessment with a family history
The Comprehensive Assessment ($775) covers the blood tests discussed here: ApoB, Lp(a), hs-CRP, homocysteine, insulin, glucose and A1c, plus the Cleveland Heart cardiac panel, a family history review and Dr. Varano's clinical evaluation. Lp(a) is measured once as an inherited baseline. The Enhanced Assessment ($999) adds a coronary calcium score and a CIMT ultrasound.
Which one fits depends mostly on your age and whether a calcium score would change your plan. Read Comprehensive vs. Enhanced: which to choose, then book through the Cardio Res-Q program page. Genetic testing for FH is not listed in either assessment, so ask our team if that is what you need.
Are You a Candidate for Cardio Res-Q?
Three quick questions about the risk factors we screen for. Your answers stay between you and the clinic.
Frequently asked questions
My father had a heart attack at 50. At what age should I be tested?
Blood tests such as a lipid panel, ApoB and Lp(a) can be done at any adult age, and earlier is better because they show what you inherited. A calcium score is usually more informative from around 40 in men and later in women, since younger scans are mostly zero.
Do I need a genetic test?
Not usually. Genetic testing is mainly considered when familial hypercholesterolemia is suspected, for example with an untreated LDL cholesterol of 190 mg/dL or more. Lp(a) is inherited, but it is measured with an ordinary blood test.
My calcium score is zero but heart disease runs in my family. Am I safe?
A zero is good news for the next several years, but guidance treats it as less reassuring when there is a strong family history. Keep managing risk factors, and ask your clinician when a repeat scan would make sense.
Related reading
This article is for general education and is not medical advice. Decisions about testing and medication should be made with your clinician. If you have chest pain or other symptoms of a heart attack, call 911.
