Lipoprotein(a), written Lp(a) and pronounced "L-P-little-a", is a cholesterol-carrying particle whose level is set largely by your genes. It is one of the most common inherited risk factors for heart disease, and one of the least often tested.
It is also a test most people only need once. This guide explains why, what a high result means, and what can honestly be done about it.
Key takeaways
- Lp(a) is a cholesterol-carrying particle whose level is largely inherited and stays fairly stable through adult life.
- Because it changes so little, one measurement is generally enough.
- Lifestyle changes barely move it, and no approved treatment lowers it in a way shown to reduce heart attacks or strokes.
- A high result is a reason to manage ApoB, blood pressure, blood sugar and other changeable risks more firmly.
- A high level does not mean you will have a heart attack, and it is a reason for close relatives to be tested.
What Lp(a) is
An Lp(a) particle is similar to an LDL particle, with an extra protein attached. That extra piece appears to make it more likely to contribute to plaque and to blood clotting, and it is linked to earlier heart attacks, strokes and narrowing of the aortic valve.1
What sets Lp(a) apart is that your level is largely inherited. Diet, exercise and weight loss, which move almost every other cholesterol number, have little effect on it. Your level is mostly established in early childhood and stays fairly stable through adult life.
Why a family history of early heart disease matters
Because Lp(a) is inherited, it runs in families. A high level is one of the common explanations for heart attacks that happen "too early" in people who otherwise looked healthy, with normal weight, normal cholesterol and no smoking.
If a parent or sibling had a heart attack, stent, bypass or stroke at a young age (a man before 55 or a woman before 65), Lp(a) is one of the first things worth checking. A high result in you is also a reason for close relatives to be tested.
Why it is usually tested once
Because the level changes so little, major guidelines now recommend measuring Lp(a) at least once in every adult. That includes European consensus, the National Lipid Association and the 2026 ACC/AHA dyslipidemia guideline.123 A single measurement is generally enough.
That is how we use it at YoungerMeMD. Lp(a) is part of the initial Cardio Res-Q lab panel. After that, we rarely recheck it. Repeating a number that is set by your genes, and that current treatments cannot meaningfully change, adds cost without changing the plan.
What counts as high
Labs report Lp(a) in one of two units, mg/dL or nmol/L. The two cannot be converted precisely, so it matters which one your report uses. As a general guide:
- US guidelines treat 50 mg/dL or higher (about 125 nmol/L or higher) as a risk-enhancing factor;
- risk continues to climb at higher levels, and very high values are associated with roughly double the risk;
- around one in five people has a level in the elevated range.
What a high Lp(a) changes, and what it doesn't
This is the part that needs saying plainly. There is currently no approved medication or supplement that lowers Lp(a) in a way shown to reduce heart attacks or strokes. Several drugs designed specifically to lower it are in large clinical trials. The first of these to report, in September 2026, lowered Lp(a) but did not reduce cardiovascular events in the way the trial set out to show. Others are still being studied.
So a high result is not a treatment target in itself. It changes how firmly we manage everything that can be changed:
- ApoB and LDL are generally pushed lower when Lp(a) is high, because the total particle burden is what the artery wall sees.
- Blood pressure, blood sugar, inflammation and smoking matter more, not less.
- Imaging, such as a CAC score, can show whether the inherited risk is already turning into plaque.
- Family testing becomes a practical recommendation.
A high Lp(a) is a reason to take the rest of your heart risk seriously and early. It is not a reason for alarm, and it does not mean you will have a heart attack.
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Frequently asked questions
Can diet or supplements lower my Lp(a)?
Not meaningfully. Lp(a) is largely genetic, and no diet or supplement has been shown to lower it enough to change heart risk. Be cautious of products that claim otherwise.
Do statins lower Lp(a)?
No. Statins do not lower Lp(a) and may raise it slightly.4 They remain useful when Lp(a) is high, because they lower LDL and total particle burden, which is where the benefit comes from.
My Lp(a) is normal. Do I need it checked again?
Usually not. Because the level is inherited and stable, a normal result generally stands.
Should my children be tested?
If your level is high, first-degree relatives are commonly advised to be tested once. Their own clinician can guide timing.
Related reading
This article is for general education and is not medical advice. Lab results should be interpreted by a clinician in the context of your full history. If you have chest pain or other symptoms of a heart attack, call 911.
