# ApoB, Lp(a) and hs-CRP: three tests, different questions

ApoB reflects particle concentration, Lp(a) adds inherited risk information, and hs-CRP measures inflammation. How their roles differ.

Canonical: https://velri.co/blog/apob-lpa-hscrp-cardiovascular-baseline-longevity-executive
Publisher: Velri (https://velri.co/about)
Published: 2026-07-20
Updated: 2026-09-30
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ApoB, Lp(a) and hs-CRP measure different things: cholesterol-carrying particles, a largely inherited lipoprotein, and inflammation. They can add information to a cardiovascular assessment, but they are not a required three-test package for everyone. [1][2][3][4]

## ApoB: how many potentially harmful particles?

Apolipoprotein B, or ApoB, is a protein on particles that can deposit cholesterol in artery walls. Its blood level reflects the concentration of these particles. That differs from LDL cholesterol, which describes the cholesterol being carried. [1]

ApoB can be informative when particle concentration and LDL cholesterol give different impressions of risk. The 2026 multisociety dyslipidemia guideline describes selective ApoB testing, particularly in situations such as elevated triglycerides, diabetes or low LDL cholesterol achieved with treatment. [4]

For that specific comparison, see [ApoB vs. a standard cholesterol test](/blog/apob-vs-standard-cholesterol-longevity-exec).

## Lp(a): an inherited part of the picture

Lipoprotein(a), usually written Lp(a), is a cholesterol-carrying particle whose level is strongly influenced by genes. It generally changes little over time. Elevated Lp(a) can add cardiovascular risk even when a routine cholesterol result looks reassuring. [2]

The 2026 guideline recommends measuring Lp(a) at least once in adulthood. [2][4]

## hs-CRP: inflammation, without its location

High-sensitivity C-reactive protein, or hs-CRP, detects small amounts of a protein the liver makes in response to inflammation. The test can help estimate cardiovascular risk, but it cannot show where inflammation is occurring or what caused it. Infection and other inflammatory conditions can affect CRP. [3]

The American Heart Association describes hs-CRP as a possible additional test when a person's estimated cardiovascular risk is borderline. Persistently elevated results require consideration of other causes of inflammation. A single high value does not establish inflamed arteries. [5]

## Sources
[1] ApoB: Another look at heart disease risk | American Heart Association (2026). https://www.heart.org/en/health-topics/cholesterol/how-to-get-your-cholesterol-tested/apolipoprotein-b
[2] Lipoprotein (a) Blood Test: MedlinePlus Medical Test (2025). https://medlineplus.gov/lab-tests/lipoprotein-a-blood-test/
[3] C-Reactive Protein (CRP) Test: MedlinePlus Medical Test (2025). https://medlineplus.gov/lab-tests/c-reactive-protein-crp-test/
[4] Guideline on the Management of Dyslipidemia - Professional Heart Daily | American Heart Association (2026). https://professional.heart.org/en/science-news/2026-guideline-on-the-management-of-dyslipidemia/top-things-to-know
[5] An hsCRP test can add clarity to your heart health picture | American Heart Association (2026). https://www.heart.org/en/health-topics/cholesterol/how-to-get-your-cholesterol-tested/high-sensitivity-c-reactive-protein

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