Lp(a): The curious piece of the puzzle

Lp(a), pronounced L-P-little-a, is a genetic variation of LDL cholesterol that is a crucial piece of the puzzle of heart risk. Very few people have been tested for it, even though it's elevated in 1 in 5 people. It doesn't respond to diet or exercise, and most doctors don't test for it. But in 2026, the AHA and ACC recommended for the first time that every adult get tested at least once.

What is Lp(a)?

Lp(a) is an LDL particle with an extra protein called apo(a) attached to it. Think of regular LDL as a delivery truck carrying cholesterol through your blood. Lp(a) is the same truck, but with a sticky coating that makes it bind to artery walls more easily, trigger more inflammation, and resist your body's normal cleanup process.

This is what sets Lp(a) apart from regular LDL or ApoB. It's not just about how much cholesterol you're carrying. It's about a particle that's uniquely prone to causing damage.

What's a normal Lp(a) level?

Labs report Lp(a) in two units. The preferred unit is nmol/L because it's more consistent across different lab methods. Here's how to read your number:

To see how your Lp(a) level affects your personal cardiovascular risk alongside other factors like blood pressure and LDL, you can use the Lp(a) clinical risk calculator.

What makes high Lp(a) problematic?

Lp(a) increases your cardiovascular risk through three mechanisms:

• It builds plaque faster than regular LDL because it binds to artery walls more readily.
• It promotes blood clots by interfering with your body's clot-dissolving system.
• It drives chronic inflammation that can destabilize existing plaque, making it more likely to rupture.

Elevated Lp(a) also accelerates calcification of the aortic valve, increasing the risk of aortic stenosis over time. The risk is continuous: the higher the level, the higher the risk.

Is Lp(a) genetic?

Over 90% of your Lp(a) level is determined by your genes. It's set at birth and generally stays stable throughout your life, though levels can shift during pregnancy, after menopause, or with kidney or thyroid disease. For most people, a single test gives you a reliable lifetime reading.

Lp(a) is strongly inherited. If yours is high, your parents, siblings, and children should get tested too. Levels also vary significantly across populations:

Who should get tested?

This guide is for educational purposes and is not medical advice. Please consult your doctor for personalized recommendations.

The 2026 ACC/AHA guidelines recommend that every adult get Lp(a) measured at least once. This is a Class I recommendation, the strongest level, and the first time US guidelines have endorsed universal Lp(a) screening.

Test earlier if you have a family history of heart attack before 55 (men) or 65 (women), a personal history of early heart disease, a diagnosis of familial hypercholesterolemia, or a family member with known elevated Lp(a).

How to get the test

Lp(a) is not included in a standard lipid panel. You need to ask your doctor to order it by name. Request "lipoprotein(a)" or "Lp(a)" specifically.

No fasting is required. It's a simple blood draw that can be added to any routine lab visit. Since Lp(a) is genetically determined, you generally only need to test once. Consider retesting if you go through menopause or are diagnosed with kidney or thyroid disease, as these can shift levels.

Can you lower Lp(a)?

Today, no approved drug meaningfully lowers Lp(a).

• Statins don't reduce it and may slightly raise it in some people, though they're still important for lowering LDL when indicated.
• PCSK9 inhibitors lower Lp(a) modestly (about 20–25%), but that hasn't been shown to reduce heart events specifically through Lp(a) lowering.
• Niacin can lower it by a similar amount, but is not generally recommended due to tolerability issues and lack of proven event reduction.

However, hope is on the way. Five drugs in late-stage clinical trials are lowering Lp(a) by 80–98%. No Lp(a)-specific drug is FDA-approved yet, but the first results from large cardiovascular outcome trials are expected soon.

What to do if your Lp(a) is high

Since you can't directly lower Lp(a) yet, the strategy is to lower every other risk factor more aggressively. Think of elevated Lp(a) as raising the bar on what counts as safe for everything else:

• Lower your LDL aggressively. Target below 70 mg/dL, or below 55 mg/dL if you're high risk. Lipid lowering therapy is the single most impactful lever you have.
• Keep blood pressure under 120/80. Hypertension compounds the damage Lp(a) does to artery walls.
• Manage insulin resistance. Treat prediabetes or diabetes early and aggressively.
• Consider a coronary CT angiogram. This can tell you whether plaque has already formed, which helps you and your doctor decide how urgently to act.

A coronary CT angiogram can be especially valuable when Lp(a) is elevated. Lp(a) drives soft (non-calcified) plaque that a calcium score alone can miss entirely.

The bottom line

One blood test, once in your life, tells you whether you carry a genetic risk factor that affects 1 in 5 people. If it's normal, great! If it's high, you can start reducing your other risk factors now for your long and healthy life. Either way, you're better off knowing.