Quick answer: Lipoprotein(a), usually written Lp(a), is a cholesterol-carrying particle whose level is set mostly by your genes and stays fairly stable through adult life. Large studies following hundreds of thousands of people link higher Lp(a) with more heart attacks and strokes, even when other cholesterol numbers look good. Because it is not part of a standard cholesterol panel and changes little over time, the European Atherosclerosis Society recommends that every adult have it measured at least once.
Key takeaways
Lipoprotein(a) is a cholesterol-carrying particle whose level is set mostly by your genes and stays fairly stable through adult life.
Large studies have linked higher levels with higher risk of heart attack and stroke, independent of LDL cholesterol.
Many experts now suggest checking it at least once in adulthood, because it can change how the rest of a heart-health picture is read.
Many people have had their cholesterol checked for years and assume they have a complete picture of their cardiovascular risk. A standard lipid panel tells you about LDL, HDL, and triglycerides, but it leaves out one marker that is largely inherited and surprisingly common. That marker is lipoprotein(a). It is one of the few blood tests that most adults only need once, and the result can change how closely you and your clinician look at everything else.
What lipoprotein(a) is
Lp(a) looks a lot like an LDL particle, the kind of cholesterol carrier most people have heard of, but it has an extra protein called apolipoprotein(a) wrapped around it. That additional protein makes the particle behave differently. Researchers believe it promotes inflammation and plaque build-up in artery walls, partly because Lp(a) carries oxidized fats called oxidized phospholipids.
What makes Lp(a) unusual is how little it responds to the things that move other cholesterol numbers. According to a 2022 consensus statement from the European Atherosclerosis Society, more than 90 percent of the variation in Lp(a) between people is explained by genetics, and adult levels are usually reached by around age five. The same statement estimates that elevated Lp(a) affects roughly 1.4 billion people worldwide. If you would like a refresher on the other markers in a lipid panel, my guide to understanding your cholesterol panel covers LDL, HDL, ApoB, and triglycerides.
What a 126,000-person analysis found
One of the first studies to settle how much Lp(a) matters came from the Emerging Risk Factors Collaboration, which pooled individual records from 126,634 people in 36 long-term studies. None of the participants had known coronary heart disease or stroke when they entered. Over about 1.3 million person-years of follow-up, people in the top third of Lp(a) levels had higher rates of coronary heart disease than people in the bottom third.
After the researchers accounted for age, sex, other lipids, and conventional risk factors, each step up in Lp(a) was still linked with about 13 percent higher risk of coronary heart disease and about 10 percent higher risk of ischemic stroke. Two other findings stand out to me. Lp(a) was only weakly related to the usual risk factors, which means it gives information you cannot get from them, and it stayed highly consistent within the same person over several years. Higher Lp(a) was not linked with deaths from cancer or other non-vascular causes, so the concern is specific to the blood vessels. The free full text is here: Lipoprotein(a) concentration and the risk of coronary heart disease, stroke, and nonvascular mortality.
What the UK Biobank added
A 2021 analysis of the UK Biobank looked at more than 460,000 middle-aged adults followed for a median of about 11 years. The relationship between Lp(a) and cardiovascular events was close to a straight line across the whole range, with roughly 11 percent higher risk for every 50 nmol/L increase. In other words, there was no single cutoff where risk suddenly appeared, although the highest levels clearly carried the most risk.
About 12 percent of people without existing cardiovascular disease had a level of 150 nmol/L or higher, and that group had about 50 percent higher risk of a first event over the follow-up period. The study also showed that typical levels differ a great deal by ancestry. The median was 19 nmol/L in white participants, 31 in South Asian participants, 75 in Black participants, and 16 in Chinese participants. Even so, the added risk for each step up in Lp(a) looked similar across these groups. The free full text is here: Lp(a) concentrations and incident atherosclerotic cardiovascular disease: new insights from a large national biobank.
Why experts now say to test it at least once
The 2022 European Atherosclerosis Society consensus statement brought together genetic, population, and imaging research and concluded that Lp(a) is a causal risk factor for atherosclerotic cardiovascular disease. It also found that high Lp(a) is associated with calcification of the aortic valve, which can narrow the valve over time. The panel noted that elevated Lp(a) remains a risk factor even when LDL cholesterol is very low, which is one reason a good standard lipid panel does not rule it out.
Based on that evidence, the panel recommends measuring Lp(a) at least once in every adult. It also highlights the value of testing relatives when someone has a very high level, a family history of early heart disease, or familial hypercholesterolemia, an inherited condition that raises LDL from birth. The free full text is here: Lipoprotein(a) in atherosclerotic cardiovascular disease and aortic stenosis: a European Atherosclerosis Society consensus statement.
How to read your result
Labs report Lp(a) in either milligrams per deciliter (mg/dL) or nanomoles per liter (nmol/L), and the two units are not directly interchangeable because test methods differ. The consensus panel suggests a practical way to think about the numbers. A level below 30 mg/dL or 75 nmol/L is considered low enough to set Lp(a) aside as a risk factor, and a level above 50 mg/dL or 125 nmol/L is considered high. Results in between fall into a gray zone that matters more when other risk factors are present.
Very high levels, above 180 mg/dL or 430 nmol/L, are associated with a lifetime risk similar to that of familial hypercholesterolemia. The panel also stresses that Lp(a) risk is continuous, so a result should always be read alongside age, blood pressure, blood sugar, smoking history, family history, and other lipids rather than on its own. If your report lists the unit and the name of the assay, it is worth keeping a copy, since that makes any future comparison more reliable.
What a high result means in practice
This is where Lp(a) differs from most of the markers I discuss on this blog. Lifestyle has only a small effect on it. The consensus statement notes that fasting and physical activity have little or no effect, and dietary changes shift it only modestly, sometimes in the opposite direction from other lipid goals. Medicines designed specifically to lower Lp(a) have been in large clinical trials, but the panel wrote that these trials are needed to confirm a benefit for the heart and aortic valve.
Because the number itself is hard to change, the panel recommends early and more intensive attention to the risk factors that can change. In practice, that means looking carefully at LDL cholesterol and ApoB, blood pressure, blood sugar and insulin, inflammation, and smoking, and taking them more seriously at a younger age than you might otherwise. My articles on blood sugar and insulin and the hs-CRP inflammation test explain what those markers show, and my overview of heart strain markers covers Lp(a) alongside small dense LDL and NT-proBNP.
The habits that support the rest of your cardiovascular picture still matter a great deal. Regular strength training, a diet built on whole foods and healthy fats like extra virgin olive oil, and consistent sleep will not move Lp(a) much, but they help keep the other numbers in a healthy range. A high Lp(a) result is not a verdict. It is useful information that lets you and your clinician plan earlier and pay closer attention, and it can prompt your parents, siblings, and children to get checked as well.
When I review functional lab testing with someone, Lp(a) is one of the first things I look for in their history. If it has never been measured, it is a simple addition to the next blood draw, and for most people the result does not need to be repeated.
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Questions to bring to your clinician
These questions can help you get the most out of your next visit.
How might Lipoprotein(a) relate to my own health history and goals?
What would a result like my Lp(a) mean for me, given my health history?
Which other labs would be worth pairing with my Lp(a) to get a clearer picture?
When would it make sense to recheck my Lp(a), and what could I work on in the meantime?
Frequently asked questions
Is Lp(a) included in a regular cholesterol test?
No. A standard lipid panel reports total cholesterol, LDL, HDL, and triglycerides, and Lp(a) has to be ordered as a separate test. If you are not sure whether yours has been checked, look for “lipoprotein(a)” or “Lp(a)” on past lab reports or ask the clinician who ordered your labs.
How often should Lp(a) be checked?
For most adults, once is enough, because the level is largely inherited and stays fairly stable over time. A repeat test may make sense in specific situations, such as a result close to a decision point or a major change in health, and that is a good conversation to have with your clinician.
If my Lp(a) is high, should my family be tested?
The European Atherosclerosis Society panel sees real value in testing relatives of people with high Lp(a), since the level is passed down through families. Parents, siblings, and children can ask their own clinicians about adding it to their next blood draw.
Sources
- Kronenberg et al. Lipoprotein(a) in atherosclerotic cardiovascular disease and aortic stenosis: a European Atherosclerosis Society consensus statement. European Heart Journal. 2022. Free full text on PubMed Central.
- Emerging Risk Factors Collaboration. Lipoprotein(a) concentration and the risk of coronary heart disease, stroke, and nonvascular mortality. JAMA. 2009. Free full text on PubMed Central.
- Patel et al. Lp(a) concentrations and incident atherosclerotic cardiovascular disease: new insights from a large national biobank. Arteriosclerosis, Thrombosis, and Vascular Biology. 2021. Free full text on PubMed Central.
This article is for educational purposes only and is not medical advice. It does not replace an individual evaluation. Talk with your healthcare provider before starting a new supplement, changing your diet significantly, or changing medications, especially if you are pregnant, nursing, or managing a health condition.
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