Heart attacks can occur with little warning, but the underlying risk of cardiovascular disease often develops over many years. Factors such as high blood pressure, abnormal cholesterol levels, diabetes, smoking and family history can increase a person's long-term risk even when they feel completely healthy.

One lesser-known factor is Lipoprotein(a), or Lp(a). It is a type of lipoprotein found in the blood, and its level is largely determined by genetics. Elevated Lp(a) is associated with a higher risk of atherosclerotic cardiovascular disease and stroke.

Unlike chest pain or breathlessness, high Lp(a) generally does not produce an obvious warning symptom. A blood test is needed to measure it. Knowing the result can give doctors an additional piece of information when assessing a person's overall cardiovascular risk.

What Is an Lp(a) Blood Test?

Lp(a) can be measured through a blood test. However, it may not automatically be included in a standard lipid profile, which typically reports measurements such as LDL cholesterol, HDL cholesterol and triglycerides.

Therefore, someone who has previously had a cholesterol test should not assume their Lp(a) level was also measured. The laboratory report should be checked to confirm whether Lipoprotein(a) was specifically included.

Because Lp(a) levels are strongly influenced by inherited factors and tend to remain relatively stable, major cardiovascular guidelines increasingly support measuring Lp(a) at least once in adulthood as part of risk assessment.

Whether additional testing is needed depends on the person's result, medical history and clinical circumstances.

What Does a High Lp(a) Result Mean?

According to the American Heart Association, an Lp(a) level of 50 mg/dL or 125 nmol/L or higher is generally considered elevated and is associated with increased cardiovascular risk.

However, an elevated result does not mean that a heart attack is certain to happen.

Doctors assess Lp(a) alongside several other factors, including a person's age, blood pressure, LDL cholesterol, diabetes status, smoking history and family history of premature cardiovascular disease.

For example, two people with similar Lp(a) results may have very different overall risk profiles because their other cardiovascular risk factors are different.

An Lp(a) test is therefore a tool for improving risk assessment—not a test that predicts exactly who will have a heart attack or when it will happen.

Lp(a), ApoA and ApoB Are Different Tests

The similar terminology surrounding cholesterol-related blood tests can cause confusion.

Lp(a), ApoA and ApoB are not interchangeable measurements. They provide different information about lipoproteins and cardiovascular risk.

If you specifically want your Lp(a) level checked, confirm the exact test name with the laboratory or healthcare provider. It is also important to check the units used on the report because laboratories may report Lp(a) in mg/dL or nmol/L.

A doctor can interpret the result in the context of your complete cardiovascular profile rather than treating the number in isolation.

Can Diet and Exercise Lower High Lp(a)?

Because Lp(a) levels are primarily influenced by genetics, lifestyle changes generally have a much smaller effect on Lp(a) than they can have on some other cardiovascular risk factors.

That does not mean lifestyle is unimportant.

When Lp(a) is elevated, managing other modifiable risk factors becomes especially relevant. Depending on an individual's overall health and cardiovascular risk, medical care may focus on controlling LDL cholesterol, maintaining healthy blood pressure and managing diabetes or elevated blood glucose.

Avoiding smoking is particularly important. Regular physical activity, a balanced diet, adequate sleep and maintaining a healthy weight can also contribute to overall cardiovascular health.

The appropriate LDL-C target is not identical for everyone. Doctors may recommend different targets and treatment strategies based on a person's overall cardiovascular risk and medical history.

Who Should Discuss Lp(a) Testing With a Doctor?

Lp(a) testing can be particularly relevant for people with a strong family history of cardiovascular disease.

Someone may want to discuss the test with a healthcare professional if a close family member developed a heart attack, stroke or coronary artery disease at a relatively young age.

A family history of unusually high cholesterol can also be important.

People who already have cardiovascular disease or other major risk factors may also have reasons to discuss Lp(a) measurement with their doctor as part of a broader risk assessment.

High Lp(a) Does Not Mean a Heart Attack Is Inevitable

Receiving an elevated Lp(a) result can be concerning, but the number should be interpreted in context.

Lp(a) represents one component of cardiovascular risk. It cannot independently determine whether someone will experience a heart attack in the future.

Instead of panicking over an elevated result, patients should discuss it with a qualified healthcare professional who can assess their blood pressure, cholesterol, blood sugar, smoking status, family history and other relevant factors.

Depending on the overall risk profile, a doctor may recommend additional testing, lifestyle measures or medical treatment.

Know the Actual Warning Signs of a Heart Attack

It is also important not to confuse a risk factor such as high Lp(a) with symptoms of an ongoing heart attack.

Possible heart attack warning signs can include chest pressure, squeezing or discomfort; shortness of breath; sweating; nausea or lightheadedness; and discomfort spreading to the arm, shoulder, back, neck or jaw. Symptoms can vary between individuals, and not everyone experiences classic severe chest pain.

Anyone experiencing possible heart attack symptoms should seek emergency medical care rather than waiting for a blood test or attempting to assess their risk at home.

Lp(a) testing can help reveal an inherited cardiovascular risk that may otherwise remain hidden, but it is only one part of the bigger picture. Understanding that risk early gives patients and doctors an opportunity to focus more carefully on the cardiovascular factors that can be monitored and managed.