What is a good Lp(a) level?

Normal is tricky for Lp(a), because levels are skewed: most people are low and a long tail is very high. In 460,506 UK Biobank adults the median was 19.6 nmol/L, the middle half ran from 7.6 to 74.8 nmol/L, and 12.2% of people without heart disease were at 150 nmol/L or more [4].

Guidelines therefore define a good level by risk, not by population averages. The EAS calls below 30 mg/dL (75 nmol/L) the rule-out zone [1], and the NLA calls below 75 nmol/L low risk [2]. The ESC/EAS 2025 update says risk starts to rise slightly from 30 mg/dL (62 nmol/L) [5]. The lowest risk in Copenhagen was below 5 mg/dL [6].

Each group sets its lines differently, so the same result can be labeled low, intermediate or high [1][2][5][7][8][9][10]. Older thresholds follow the comparison by Kaur and colleagues [11]. The range chart shows the common bands with each guideline's cutoff.

Apo(a) can carry a few or dozens of kringle repeats, so a single particle can be light or heavy. Two people with the same particle count, the number that drives risk, can have different mass results [3]. Many tests also bind large and small apo(a) unevenly [3].

The EAS declines to set a conversion factor because assays vary so much, and uses 2 to 2.5 nmol/L per mg/dL only as a rough guide [1]. You can see the looseness in the guidelines themselves: 50 mg/dL is written as 100 nmol/L by the Canadian guideline [11], 105 nmol/L by the ESC/EAS 2025 update [5] and 125 nmol/L by the EAS and NLA [1][2].

What to do with your own numbers:

• Compare results only in the same unit, ideally from the same lab.
• Prefer nmol/L when you have the choice [5].
• If you only have mg/dL, use the mg/dL cutoffs rather than converting.

The UK Biobank analysis found hazard ratios per 50 nmol/L of 1.11 in White, 1.10 in South Asian and 1.07 in Black participants [4]. The same cutoffs therefore apply across ancestries, though more people of African ancestry cross them. Japan's 2026 consensus notes that median levels there are lower than in Western populations and still sets high risk at 125 nmol/L [9]. How much the number of kringle repeats explains also varies by ancestry, from about 30% to 70% [1].

The EAS notes that levels can rise until adulthood, so a test in childhood may need repeating [1]. In adults, Lp(a) is highly consistent over years [12]. The ESC/EAS 2025 update says Lp(a) may increase after menopause and suggests a second test when an earlier result was borderline [5]. Postmenopausal hormone therapy is associated with about 25% lower Lp(a), but it is not used as an Lp(a) treatment [1].

In Copenhagen, people below 5 mg/dL had the lowest heart attack risk [6]. The EAS consensus flags a possible association between very low Lp(a) and diabetes as an open question [1]. As drugs that lower Lp(a) by over 90% enter outcome trials, their safety records will help answer it [13][14]. To track diabetes risk directly, see HbA1c and fasting insulin.