Lipoprotein(a)

Lipoprotein(a) — Lp(a) — is a variant of LDL: an LDL-like particle with an extra protein, apolipoprotein(a), bound to its apoB-100 (StatPearls). These particles are stickier than other LDL particles, making them more prone to causing blockages and clots (MedlinePlus).

The level is genetically determined — the apolipoprotein(a) gene accounts for more than 90% of the variation between people (StatPearls). You reach your adult level by about age 5, and it tends to stay there for life (MedlinePlus).

Elevated Lp(a) is pro-atherosclerotic, pro-inflammatory, and pro-thrombotic. It independently raises the risk of atherosclerosis, coronary artery disease, stroke, and aortic stenosis — narrowing of the aortic valve (StatPearls).

A blood test — but not part of the standard lipid panel, so it has to be specifically ordered. Routine cholesterol results can look healthy while Lp(a) is high (MedlinePlus).

Results are reported in mg/dL or nmol/L. Because apo(a) varies in size from person to person, immunoassays can over- or under-estimate the true concentration; nmol/L (particle count) is the preferred unit where available (StatPearls).

Since the level is genetically stable, European (ESC) guidance recommends measuring it at least once in a lifetime (StatPearls).

The gauge zones follow the risk bands described in StatPearls:

• Optimal — below 14 mg/dL
• Borderline — 14–30 mg/dL
• High — 31–50 mg/dL
• Highest risk — above 50 mg/dL, associated with increased cardiovascular disease

Population levels span an enormous range — from under 1 to over 1,000 mg/dL — and typical levels differ between ancestries (StatPearls).

These bands are risk stratification, not a treatment target. There is no FDA-approved therapy specific to lowering Lp(a); the clinical response to a high result is intensive management of overall cardiovascular risk (StatPearls). None of this is medical advice — interpret your result with your clinician.

Can I lower it with lifestyle? Mostly no. Diet and exercise may not change Lp(a) levels (MedlinePlus) — moderate exercise shows minimal effect, and statins show mixed results and can even raise it. Some drugs move the number (PCSK9 inhibitors lower it ~26%; niacin 20–30% without proven cardiac benefit), but no Lp(a)-specific therapy is FDA-approved (StatPearls).

Should I get tested? Guidelines differ on universal screening, but testing is commonly advised with a family history of early heart disease, premature or recurrent cardiovascular disease despite statins, or severe hyperlipidemia — and ESC guidance suggests everyone measure it at least once (StatPearls, MedlinePlus).

Does it run in families? Yes — your genes control how much Lp(a) you make (MedlinePlus), with a single gene explaining over 90% of the variation (StatPearls).