Do I Need to Get My Lp(a) Tested More Than Once?

The 2026 ACC/AHA dyslipidemia guideline did something no US guideline had done before: it told clinicians to measure lipoprotein(a) at least once in adulthood, reasoning that lifestyle barely moves the number and repeat testing is generally unnecessary (see [1]). The first half of that has held up. The second half is now being argued with. In 12,202 UK Biobank participants retested a median of 4.4 years apart, the extremes stayed put, with only 2.6% of the low group, under 75 nmol/L, drifting into the intermediate band. The middle did not hold. Among people who started intermediate, 29.5% sat in a higher risk category at the second draw, and 17.5% of the high group had fallen back to intermediate (see [2]).

Two cohorts published since point the same direction. STAR-Lp(a) retested 1,263 cardiology outpatients a median of 12 months apart and found median within-person variability of 16.7%, with 28.2% of people shifting by at least 30% and 14% by at least 50%; its authors concluded the once-in-a-lifetime recommendation should be revised (see [3]). A German cohort of 992 adults contributing 2,849 measurements found a median intraindividual coefficient of variation of 16.3%, and 11.3% crossed a clinical threshold, most of them upward (see [4]). Some of that movement is the assay rather than the person. The same analysis reported limits of agreement spanning roughly 169 nmol/L, which should humble anyone reading a single Lp(a) result to two significant figures.

This is observational data, not a trial, and it does not overturn the genetics. Group means stayed flat in all three cohorts, and nothing here suggests Lp(a) answers to diet. What it does say is that the instability clusters exactly where the decision is closest to a coin flip, and that a lone borderline draw is the weakest evidence anyone can reason from. One value is a screening result. Two values with dates attached are a measurement, which is the whole argument for tracking biomarkers over time instead of collecting them one panel at a time.

This is general information, not medical advice — talk to a qualified clinician about your own situation.