Lipoprotein(a), or Lp(a), is a largely inherited lipoprotein that can increase atherosclerotic cardiovascular and aortic valve disease risk. It is not included in a routine cholesterol panel. Current U.S. guidance recommends measuring it at least once in adulthood.
If heart disease runs in your family, a reassuring standard panel may not answer every relevant question.
What the result tells you
Lp(a) is an LDL-like particle with an additional protein attached. Its level is strongly influenced by genetics. Elevated values can help explain inherited risk that is not apparent from ordinary LDL cholesterol alone.
Laboratories report Lp(a) in either nmol/L or mg/dL. Values of at least 125 nmol/L or 50 mg/dL are commonly used as risk-enhancing thresholds. The units are not interchangeable through a reliable fixed conversion. Risk also exists along a continuum rather than beginning abruptly at a cutoff.
What changes after a high result
The prevention discussion should focus on the factors you can modify, including LDL-related risk, blood pressure, smoking, and metabolic health. First-degree relatives may also benefit from testing.
Lifestyle improvement remains worthwhile even when Lp(a) itself changes very little. The purpose is to reduce overall risk, not to judge your efforts by an inherited number.
Avoid two common assumptions
A high Lp(a) result does not prove that you have obstructed arteries. A lower result does not exclude other causes of cardiovascular disease.
Bring the value and its units to your appointment. Ask how the result changes your plan and whether family screening is appropriate. Knowing inherited risk can help you begin prevention earlier and make treatment decisions with greater clarity.
Educational notice
This article provides general education and does not replace personalized medical advice. Consult your clinician before starting, changing, or stopping treatment. For a medical emergency, call 911.