Lp(a) - Lipoprotein(a) — What Your Blood Test Result Means

The Genetic Cardiovascular Risk Factor You Can't Diet Away

Lp(a) is a special LDL particle with an extra protein (apolipoprotein(a)) attached. It's almost entirely genetically determined—diet, exercise, and most medications barely touch it. Elevated Lp(a) is one of the strongest genetic risk factors for heart attack and aortic valve disease. About 20% of the population has elevated levels.

What is Lp(a) - Lipoprotein(a)?

Lp(a) is an LDL-like particle with apo(a) covalently bound to apoB. Apo(a) is structurally similar to plasminogen, giving Lp(a) prothrombotic properties. Levels are >90% genetically determined (LPA gene). Not meaningfully affected by diet or exercise. Only needs to be measured once.

↑ What High Lp(a) - Lipoprotein(a) Means

Increased cardiovascular risk that's largely genetic. Lp(a) >50 mg/dL (or >125 nmol/L) is elevated and affects ~20% of people. It's both atherogenic (promotes plaque) and prothrombotic (promotes clotting). Also associated with aortic valve calcification.

Common symptoms:

Asymptomatic until cardiovascular event · Premature heart attack or stroke (family pattern) · Aortic valve stenosis (calcification)

↓ What Low Lp(a) - Lipoprotein(a) Means

Very favorable. Low Lp(a) significantly reduces this genetic risk component.

Common symptoms:

No symptoms—favorable

Why It Matters

When normal:

Independent, causal cardiovascular risk factor

Only needs to be measured once (genetically determined)

Identifies high-risk patients who need aggressive LDL lowering

Novel Lp(a)-lowering therapies in clinical trials

Risks if abnormal:

Elevated: increased MI, stroke, aortic valve stenosis risk

>50 mg/dL: 2-3x increased CVD risk

Currently no approved Lp(a)-lowering therapy

Common—affects ~20% of population

What Can Cause Abnormal Levels?

Genetics (LPA Gene)

95% likely

Lp(a) levels are >90% determined by the LPA gene. Inherited from parents. Stable throughout life.

Kidney Disease

CKD and nephrotic syndrome can elevate Lp(a).

Hypothyroidism

Hypothyroidism mildly elevates Lp(a). Treating hypothyroidism lowers it.

Menopause

Lp(a) increases after menopause.

What You Can Do

Lp(a) is genetically determined—lifestyle has minimal impact

Impact: Diet and exercise don't meaningfully change Lp(a) \u00B7 Timeline: N/A

Measure once in lifetime (doesn't change)

Impact: One-time screening, especially if family history of early CVD \u00B7 Timeline: One-time

If Lp(a) elevated: aggressively optimize all OTHER modifiable risk factors

Impact: Since you can't lower Lp(a), make everything else as good as possible \u00B7 Timeline: Ongoing

If lifestyle changes aren't enough:

Lower LDL/ApoB more aggressively if Lp(a) is high

Impact: Compensates for Lp(a) risk by reducing total atherogenic burden \u00B7 Timeline: 4-8 weeks

Treat hypothyroidism if present (lowers Lp(a))

Impact: One of few conditions where treating lowers Lp(a) \u00B7 Timeline: 4-8 weeks

Recommended retest: One-time measurement (genetically fixed). No need to retest.

Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice. Always consult your doctor for diagnosis and treatment.

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