What is Lp(a)? An inherited heart risk most people never check

What the particle is

Lp(a) looks much like an LDL particle, with a core of cholesterol and an ApoB protein on its surface. What makes it different is an extra protein, apolipoprotein(a), wrapped around it. That addition appears to make the particle more likely to contribute to plaque, inflammation and blood clotting.

The American Heart Association notes that high Lp(a) raises the risk of heart attack, stroke and peripheral artery disease and can significantly increase the risk of aortic stenosis, a narrowing of the heart's main valve.

Why it's mostly about your genes

Your Lp(a) level is largely determined by variations in the LPA gene. The National Heart, Lung, and Blood Institute describes it as more heritable than high blood pressure, diabetes or obesity. Levels stay fairly stable through adult life and do not change much with diet or exercise.

Because it is inherited, a high result has implications for your family. The AHA recommends that close relatives, including parents, siblings and children, consider testing too.

Why it has rarely been measured

Lp(a) is not part of a standard cholesterol panel and needs a separate test. Historically, many clinicians did not order it because there was no specific treatment to offer. That has changed in two ways: guidelines now recognize the value of knowing it for overall risk management, and medicines that target it directly are in late-stage research.

The ACC's summary of the 2026 ACC/AHA dyslipidemia guideline says Lp(a) should be measured at least once in every adult's lifetime and includes cascade screening of relatives.

Reading your result

Lp(a) is reported in either nmol/L, which counts particles, or mg/dL, which measures mass. The two are not directly interchangeable because particle size varies between people, so it is best to compare results in the same unit.

• The AHA notes that a level of 125 nmol/L or higher can raise heart attack and stroke risk.
• The 2018 ACC/AHA cholesterol guideline treats 50 mg/dL or 125 nmol/L and above as a risk-enhancing factor.
• The 2026 guideline summary notes that above 250 nmol/L is associated with at least double the risk.
• Risk rises progressively with level; there is no sharp safe cutoff.

What a high result should change

A high Lp(a) does not mean a heart attack is inevitable. It means other risk factors deserve tighter control, because you cannot easily lower Lp(a) itself.

• Lowering LDL-C and ApoB, often to stricter goals
• Controlling blood pressure carefully
• Not smoking
• Improving insulin sensitivity and managing weight
• Discussing whether a coronary calcium scan would clarify your risk
• Encouraging close relatives to be tested

Treatment options today

Lifestyle changes do not lower Lp(a), according to the AHA, but they do reduce overall cardiovascular risk. The NHLBI notes that PCSK9 inhibitors lower Lp(a) by about 20 to 30 percent and that lipoprotein apheresis is used in some very high-risk people. Several drugs designed specifically to reduce Lp(a) are in clinical trials, but none is yet established practice.

Lp(a) and women in midlife

Research summarized in the American Heart Association's 2020 statement on the menopause transition found that Lp(a) levels peaked in late perimenopause and early postmenopause, alongside rises in LDL cholesterol and ApoB. The change is modest compared with the large differences between people that are set by genes, so a single adult measurement still gives most of the information you need.

For women with a high Lp(a), the menopause years are a particularly good time to tighten control of other risk factors, since overall cardiovascular risk climbs after menopause.

Talking to your family

Because Lp(a) is inherited, a high result is information your relatives can use. Sharing your result gives them the chance to test early and manage their other risk factors from a younger age.

What it doesn't mean

A normal Lp(a) does not make you immune to heart disease; LDL, blood pressure, diabetes and smoking still matter. A high Lp(a) is not the same as high LDL cholesterol and will not show up as such on a routine panel. And because the level is stable, repeating the test every year rarely adds anything.

HealifyMD's Comprehensive Lab Panel is $199, confirmed at your eligibility review. A licensed clinician can include Lp(a) and explain what your result means for your overall plan.