Lipoprotein(a): The Inherited Risk Marker Most People Never Test

What is lipoprotein(a)?

Lipoprotein(a) is an LDL-like particle with an additional protein, apolipoprotein(a), attached to it. That extra protein makes the particle both atherogenic and prothrombotic — it contributes to plaque formation and interferes with normal clot breakdown.

Your Lp(a) concentration is roughly 80–90% genetically determined. It is largely set at birth, changes little with diet or exercise, and therefore only needs to be measured once in most adults.

Why does it matter?

Roughly one in five people carries an elevated Lp(a). It is an independent risk factor for heart attack, stroke, and calcific aortic valve disease — independent meaning it adds risk even when LDL cholesterol, blood pressure, and everything else look reassuring.

Knowing it changes decisions. An elevated Lp(a) is a common reason to be more aggressive about the risk factors that can be modified: ApoB, blood pressure, insulin resistance, and smoking.

What does Lp(a) tell us?

• Whether you carry an inherited, lifelong elevation in cardiovascular risk
• Why premature heart disease may run in a family with otherwise unremarkable lipids
• How intensively other, modifiable risk factors should be managed
• Information worth sharing with first-degree relatives, who may also be affected

Why might it be missed on routine bloodwork?

Because Lp(a) is not readily modified by lifestyle and historically had no targeted therapy, it was rarely screened. Guidance is shifting toward measuring it at least once in every adult, but standard panels have not caught up, and it is almost never included in an annual physical.

What can cause it to be high?

• Genetics — by far the dominant factor, through variation in the LPA gene
• Ancestry-related differences in average concentration
• Chronic kidney disease, especially nephrotic syndrome
• Hypothyroidism, which can modestly raise levels
• Menopause, associated with a modest rise in some women
• Acute inflammation, which can transiently elevate a single measurement

What can cause it to be low?

A low lipoprotein(a) is simply a favorable inherited variant and does not require attention. Low values are occasionally seen with hyperthyroidism or significant liver disease, since the liver produces the particle.

How does it relate to other biomarkers?

Questions to discuss with your healthcare provider

• Have I ever had lipoprotein(a) measured, even once?
• Given my family history of early heart disease, is this a priority for me?
• If mine is elevated, what ApoB and blood pressure targets should I aim for?
• Should my siblings, parents, or children be tested?

Frequently asked questions