Lipoprotein(a) measures a particular cholesterol-carrying particle that resembles LDL but carries an extra protein, apolipoprotein(a), attached to it. Its concentration is set largely by inheritance and stays fairly stable across life, so it speaks for an inherited component of cardiovascular risk rather than for current diet or lifestyle. It is usually measured once, to place a person's baseline risk alongside the rest of the lipid picture.
No readings for this marker yet.
Raised values most often reflect the inherited variant that produces more of this particle, and are associated on a population level with earlier atherosclerotic disease of the heart arteries and with narrowing of the aortic valve. Levels can also drift upward during kidney disease, in an underactive thyroid gland, and after menopause. Low values carry no recognised health meaning and are not treated as a finding. A raised result describes long-term risk, not an event in progress, and belongs in a conversation with a doctor about the overall risk picture.
Concentration barely responds to fasting, time of day, or a recent meal, but a current inflammatory illness or infection can push it temporarily higher, so a high result found during illness is worth repeating once recovery is complete. Assays differ in whether they report mass or particle number, which makes results from different laboratories hard to compare directly. It is read alongside LDL cholesterol, non-HDL cholesterol, and apolipoprotein B, since those describe the burden of atherogenic particles that this one adds to.
Reference ranges are general adult values and depend on lab, assay, age and sex. For orientation, not diagnosis — discuss results with your doctor.