There’s a powerful heart-disease risk factor that about one in five people carry, that a standard cholesterol panel completely misses, and that you only ever need to check once. It’s called lipoprotein(a), or Lp(a). Most people have never heard of it, and most have never been tested, including plenty who are otherwise on top of their health.
What is Lp(a), and why haven’t I heard of it?
Lp(a) is a cholesterol-carrying particle a lot like LDL, but with an extra sticky protein wrapped around it that makes it especially good at lodging in artery walls and stiffening the aortic valve. The important part: your level is set almost entirely by your genes, more than 90 percent inherited, so you’re essentially born with your number the way you’re born with your blood type. Diet, exercise, and even statins barely move it.3 That genetic story is also why we trust it. People who inherit naturally low Lp(a) get meaningfully less heart disease, which is strong evidence that Lp(a) helps cause the damage rather than just travels with it (American Heart Association scientific statement, 2022;1 European Atherosclerosis Society consensus, European Heart Journal, 2022).2 It stays off most people’s radar for a dull reason: the routine lipid panel doesn’t include it, so no one orders it.
What counts as high, and what does my number mean?
Risk climbs gradually as the number rises, but a few landmarks help. Around 50 mg/dL (125 nmol/L) is where risk starts to lift, roughly 1.4 times the average. Up near 180 mg/dL (430 nmol/L), the top one percent or so of people, risk is about quadrupled, in the same range as familial hypercholesterolemia, the inherited high-cholesterol condition.4 One catch with the number: labs report Lp(a) in either mg/dL or nmol/L, and the two don’t convert cleanly, so make sure you’re comparing your result to the right scale.6 Ancestry matters too. Lp(a) runs about three to four times higher in people of African ancestry, and higher in South Asians, than in white populations, so it’s especially worth checking if that’s your background (2026 ACC/AHA dyslipidemia guideline).5 The risk a given level carries is about the same across groups; what differs is how common high levels are.5
Threshold table: how to read an Lp(a) result
| Result | Practical meaning | What changes |
|---|---|---|
| Low or normal | No inherited Lp(a) signal to chase | Usually no repeat test needed |
| Around 50 mg/dL or 125 nmol/L | Risk starts to rise | Treat LDL, ApoB, blood pressure, glucose, and smoking more seriously |
| Very high, around 180 mg/dL or 430 nmol/L | Risk can approach familial hypercholesterolemia range | Family testing and aggressive risk-factor control matter |
Should you get tested?
Yes, once. The 2026 ACC/AHA dyslipidemia guideline, following European guidelines that got there first,2 recommends a one-time Lp(a) measurement for every adult.5 It’s an ordinary blood draw, no fasting needed, and a single test settles it because the level barely budges over a lifetime.3 Two practical notes. First, cost: Lp(a) often runs about $20 to $100 out of pocket and isn’t reliably covered by insurance, including Medicare, so ask the lab for the cash price. Second, if your number is high, it’s family news, not just yours. Because it’s inherited, your parents, siblings, and kids each have a real chance of carrying it too, and the guidelines recommend testing them.2
The limits of treating Lp(a)
The frustrating limit is that no approved drug has proven it can lower Lp(a) and cut heart attacks.4 Statins don’t lower Lp(a), and can actually raise it slightly.5 PCSK9 inhibitors lower Lp(a) about 15 to 30 percent, but that modest drop is not enough for most people with high Lp(a) to return to a normal level. Their proven benefit still comes mostly from lowering LDL and ApoB.5 Several drugs built specifically to target Lp(a), with names like pelacarsen, olpasiran, and lepodisiran, can drop it by 80 to 98 percent and are in large trials whose first results are expected around 2026 to 2027.7 Until those trials report, we do not yet have trial results proving that lowering Lp(a) itself cuts cardiovascular events. So for now, a high number doesn’t unlock a special pill. What it does is raise the stakes on everything else you can control.
Get your Lp(a) once, then act on what you know
Get tested once. If your Lp(a) is normal, you can cross it off for good. If it’s high, it doesn’t mean you’re doomed, and it doesn’t call for panic; it means treating every other risk factor harder, because they stack on top of each other. Get your LDL and ApoB low. A statin is usually the first step; if you’re high-risk and still not at goal, a PCSK9 inhibitor can lower LDL and trim Lp(a) a bit as a bonus.5 Keep blood pressure and blood sugar in range, and don’t smoke. That still matters: among people with high Lp(a), having the healthiest risk profile was associated with about 67 percent lower cardiovascular risk than having the least healthy profile.3