A lipoprotein test that measures lipoprotein(a), or Lp(a), can uncover an inherited cardiovascular risk that a standard cholesterol panel may miss. A high result is not a prediction that you will have a heart attack or stroke. It is a risk factor your clinician can consider alongside LDL cholesterol, blood pressure, smoking, diabetes and family history.
What A Lipoprotein Test Measures
Lp(a) is a cholesterol-carrying particle, similar to LDL, with an extra protein called apolipoprotein(a). Its level is mostly determined by your genes and tends to stay fairly stable throughout life. Elevated Lp(a) is linked to a higher risk of atherosclerotic cardiovascular disease, including coronary disease and stroke, and calcific aortic valve disease. That risk can exist even when your LDL cholesterol is at its treatment target.
Because Lp(a) is usually stable, many guidelines and expert groups recommend measuring it at least once in adulthood. Recommendations differ by country and organization: some older guidance focused on people with a personal or family history of premature cardiovascular disease, while newer recommendations in several regions support testing all adults once. Testing is especially worth discussing if you or a close relative had cardiovascular disease at a young age, a family member has high Lp(a), or you have familial hypercholesterolemia. Some guidance also highlights people of African or South Asian ancestry, whose average levels are higher in population studies. Ancestry alone does not determine an individual result or their overall risk.
How To Read Lp(a) Levels And Units
Labs report Lp(a) in either milligrams per deciliter (mg/dL), a common US unit, or nanomoles per liter (nmol/L), used in many other countries. These measure different things: mg/dL reflects particle mass, while nmol/L reflects the number of particles. Since Lp(a) particles vary in size, there is no reliable fixed conversion between the units. Don’t convert your result with a generic online multiplier; use the unit and reference information on your lab report.
A result around or above 50 mg/dL or 125 nmol/L is often treated as elevated in guidelines. These are practical thresholds, not a sharp boundary between safe and dangerous: cardiovascular risk rises across a range of Lp(a) levels. Results near a cutoff should be interpreted in context, not treated as a standalone diagnosis. Ask your clinician which threshold and assay they are using, particularly if comparing results from different laboratories.
What An Elevated Result Changes
An elevated result adds information; it does not determine your future. Your overall risk depends on Lp(a) together with other factors, including LDL cholesterol, blood pressure, diabetes, smoking and personal history. A clinician may use the result to refine a risk estimate or discuss whether prevention should be more intensive. If your Lp(a) is high, relatives may also consider testing, since the level often runs in families.
There is not yet a widely available medicine specifically approved to lower Lp(a) for most people. Several targeted medicines are being studied, but lowering Lp(a) in a trial is not, by itself, proof that a treatment prevents heart attacks or strokes. Some existing treatments, including PCSK9 inhibitors, can lower Lp(a), but clinicians generally consider them in the context of a person’s overall risk and treatment needs—not as a simple fix for an isolated Lp(a) result. Specialized apheresis may be an option in limited circumstances.
For now, prevention focuses on managing risks that can be changed. Your clinician may review LDL cholesterol treatment, blood pressure, diabetes, smoking and other cardiovascular factors. Healthy habits can help lower overall cardiovascular risk, but they do not usually bring genetically high Lp(a) down substantially. That distinction matters: lifestyle still has value even if the number itself does not change.
Questions To Take To Your Clinician
Bring the actual result, including its unit, and ask how it fits with your personal and family history. Useful questions include whether your other risk factors are well managed, whether relatives should be tested, and whether your Lp(a) result changes your prevention plan. Seek medical advice for interpretation and treatment decisions; an elevated result alone is not a reason to start or stop medication.
