High Lipoprotein(a): What Does It Mean and What Happens Next?

High lipoprotein(a), or Lp(a), means your blood carries more of a particular cholesterol-carrying particle that is linked to a higher risk of heart attack, stroke and narrowing of the aortic valve. The level is mostly decided by the genes you inherit, so it is not usually a sign of an unhealthy lifestyle. A high result raises risk; it does not mean you have heart disease.

Lp(a) is a type of LDL particle with an extra protein attached. MedlinePlus describes the particles as stickier than other LDL, which may help explain why they are linked to blocked arteries and blood clots. Lp(a) is not part of a standard cholesterol test, so it has to be ordered separately. This guide covers what an existing Lp(a) result means; it cannot judge your personal risk.

High Lp(a) itself usually causes no symptoms, so feeling well does not tell you anything about the level. What matters urgently is any sign of a heart attack or stroke, whatever your test results.

Call your local emergency number straight away for the symptoms below. Do not wait for an appointment or drive yourself to hospital.

• Chest pain or pressure, especially tight or squeezing pain that may spread to the arms, neck or jaw.
• Severe breathlessness, sweating, feeling sick, or collapsing.
• A drooping face, weakness in one arm, or slurred or muddled speech, even if these pass quickly.

Yes, mostly. A European Atherosclerosis Society consensus statement reports that more than 90% of the variation in Lp(a) levels between people is explained by genes. Cleveland Clinic notes that the level you have as a child is likely to be the level you keep for years.

Because genes dominate, diet and exercise change Lp(a) very little. That does not make healthy habits pointless. They still lower overall heart risk by improving LDL cholesterol, blood pressure, weight and blood sugar, which are the risk factors you can change.

Because the level stays fairly stable through adult life, one measurement normally gives the information needed. The 2022 European Atherosclerosis Society statement advises measuring Lp(a) at least once in adults, and the 2026 US dyslipidemia guideline from the American College of Cardiology and partner societies also recommends at least one lifetime measurement.

There are exceptions. The European statement notes that kidney or liver disease and acute infections can affect results, and levels can rise in children until adulthood. Women's levels also tend to rise around menopause. If a result was taken during an illness, ask whether it is still representative.

Labs report Lp(a) in one of two units. Nanomoles per litre (nmol/L) counts particles, while milligrams per decilitre (mg/dL) measures their mass. Because Lp(a) particles vary in size between people, there is no reliable fixed conversion between the two. The European consensus panel specifically advises against using a standard conversion factor.

In practice, compare your result only with the cut-offs given for the same unit, and compare repeat or family results only when they use the same unit. Cleveland Clinic, for example, describes a level above 100 nmol/L as high, and gives separate mg/dL bands. Guidelines and labs set different thresholds, and risk rises gradually rather than switching on at one number, so ask how your lab and clinician interpret your figure.

Lp(a) is one risk factor among many. Clinicians usually weigh it alongside age, LDL cholesterol, blood pressure, diabetes, smoking, kidney function and family history. The ACC summary of the 2026 guideline says adults with elevated Lp(a) should be offered earlier ways to reduce cardiovascular risk, regardless of their LDL level.

Specific medicines designed to lower Lp(a) are still being studied, and Cleveland Clinic notes that current cholesterol medicines lower it only modestly. Decisions about treatment focus on lowering total risk and are made with your clinician. For more on the LDL side of the picture, see our guide on high LDL cholesterol. Some people are also offered a coronary calcium scan to look for existing artery calcification; our coronary calcium score guide explains how those results are read.

Often, yes. Because Lp(a) is inherited, a high level in one person means parents, brothers, sisters and children may also have a high level. The European consensus statement suggests notifying close relatives and offering them testing, sometimes called cascade testing.

Testing relatives is especially relevant when there is early heart disease in the family or familial hypercholesterolaemia. Cleveland Clinic notes that more than 30% of people with familial hypercholesterolaemia also have high Lp(a). Relatives should discuss testing with their own clinician, and the decision for a child usually depends on family history.

Bring the full report, including the unit and the lab's reference range, plus any other cholesterol results and your family history.

• What unit is my result in, and how does your interpretation of it compare with my lab's cut-off?
• Was I unwell or affected by any condition when the sample was taken, and does it need repeating?
• How does my Lp(a) change my overall heart and stroke risk estimate?
• Which of my other risk factors, such as LDL cholesterol or blood pressure, matter most now?
• Should my parents, siblings or children be offered an Lp(a) test?
• Would any further test, such as a coronary calcium scan, change what we do?

On SameCase, patients and verified doctors share de-identified cases. Reading how others with a high Lp(a) result described their units, family history and follow-up can help you notice what to ask and which documents to bring. Other people's cases cannot tell you your own risk or the right treatment; your clinician makes those decisions with you.