Lipoprotein(a), or Lp(a), is a special kind of cholesterol particle that raises the risk of heart disease and stroke. It is not included in a standard cholesterol panel.
It is mostly set by your genes, stays fairly stable over your lifetime, and can be checked with a simple blood test that almost nobody orders.
What Is Lipoprotein(a)?
Lp(a) carries cholesterol and fats in your blood, similar to LDL, the so-called bad cholesterol. It is made of an LDL-like core plus an extra protein called apolipoprotein(a).
That extra protein is the problem. It makes the particle more likely to stick in artery walls and to take part in clot formation. Because of it, high Lp(a) can be harmful even when your usual LDL cholesterol looks fine.
Why It Matters
High Lp(a) is linked to a higher risk of:
- Heart attack and coronary artery disease
- Stroke and other blood-flow problems in the brain
- Aortic valve narrowing, known as aortic stenosis
These risks are independent of other factors like LDL cholesterol and blood pressure. Lp(a) adds risk on top of everything else.
About 1 in 5 people have high enough Lp(a) to increase cardiovascular risk, and it often runs in families.
The Family History Explanation
Lp(a) often explains the family nobody could account for. A father who had a heart attack at 52 with good cholesterol. A grandmother who had a stroke and never smoked.
Because it is inherited, one high result has implications beyond you. If yours is high, your siblings, parents, and children each have a meaningful chance of carrying it too, and they can be tested.
Who Should Consider Testing
Expert groups suggest at least a one-time Lp(a) test in situations such as:
- Personal or strong family history of early heart attack, stroke, or peripheral artery disease
- Very high LDL cholesterol or suspected familial hypercholesterolemia
- Unexplained cardiovascular disease despite normal cholesterol
Because Lp(a) is stable, most people only need it checked once in their lifetime. The test is a standard blood draw and may be reported in mg/dL or nmol/L.
What Counts as High
Many guidelines use cut-offs around:
- Low risk: less than about 30 mg/dL, or under about 75 nmol/L
- Borderline: about 30 to 50 mg/dL, or about 75 to 125 nmol/L
- High: above about 50 mg/dL, or above about 125 nmol/L
These ranges help decide how strongly Lp(a) should influence your overall risk estimate and how aggressively to treat your other risk factors.
If Yours Is High
This is the part that matters, and it is more hopeful than people expect.
A high Lp(a) does not mean you will have a heart attack. It means your baseline risk is higher, so everything else you can control needs to be controlled more tightly than average.
In practice that means lower LDL and ApoB targets than someone without it, careful blood pressure control, treating insulin resistance, not smoking, and staying physically active. Statins do not lower Lp(a), but they do lower the other particles, which reduces your total risk.
We also look at inflammation, since Lp(a) appears to do more damage where there is inflammation in the vessel wall.
Why Diet Does Not Fix It
Unlike LDL, Lp(a) responds very little to diet and exercise. This frustrates people who have done everything right.
It is not a personal failure. It is a genetic trait, like your height. The response is not to try harder at the things that do not move it, but to be thorough about the things that do.
What Is Coming
Several medications designed specifically to lower Lp(a) are in late-stage clinical trials. They are not available yet, and we do not know whether lowering it will reduce events, which is exactly what those trials are testing.
If your Lp(a) is high, knowing it now means you can be treated appropriately today and be first in line if those results are positive.
How to Ask for the Test
Because Lp(a) is not part of a standard panel, you usually have to request it by name. Ask for "lipoprotein little a," written Lp(a), and be specific, since it is easily confused with ordinary LDL or with ApoB.
Coverage varies. If insurance declines it, the cash price is typically modest, and it is a once-in-a-lifetime test.
Telling Your Family
If your result is high, the most useful thing you can do is tell your relatives. Lp(a) is inherited, so siblings and children have a real chance of carrying it.
A short message is enough: your Lp(a) came back high, it is genetic, and they can ask for the test. For a family with a history of early heart attacks, that conversation can be the most valuable outcome of your lab result.
Dr. Milani is trained in heart attack and stroke prevention. We offer this care by telehealth across Washington and Idaho from our clinic in Spokane. Book a free 15-minute call to talk about testing.