A visual guide to the topic
LDL-C
Cholesterol carried in LDL particles
Non-HDL-C
Cholesterol outside HDL particles
ApoB
A measure related to atherogenic particle number
First: cholesterol and particles are not the same thing
Cholesterol travels through the bloodstream inside particles called lipoproteins. LDL-C estimates the amount of cholesterol carried inside LDL particles; it does not directly count how many atherogenic particles are present.
What does non-HDL cholesterol show?
Non-HDL-C is calculated by subtracting HDL-C from total cholesterol. It includes cholesterol carried by LDL, remnant particles, lipoprotein(a), and other ApoB-containing particles. It can be particularly helpful when triglycerides are elevated.
What does ApoB show?
Each major atherogenic particle carries one molecule of apolipoprotein B. ApoB therefore approximates the total number of these particles. Two people with a similar LDL-C can have different numbers of particles and different ApoB values.
When can results be discordant?
Discordance is more common with high triglycerides, diabetes, obesity, and metabolic syndrome. LDL-C may appear acceptable while non-HDL-C or ApoB suggests a greater atherogenic particle burden.
Which result is best?
There is no single answer for every person. LDL-C remains a central treatment marker. The 2026 ACC/AHA dyslipidemia guideline notes that ApoB can improve risk assessment, especially with triglycerides above 200 mg/dL, diabetes, or a very low achieved LDL-C. Targets and treatment decisions depend on overall cardiovascular risk—not only the laboratory reference interval.
Keep reading: kidneys and cardiovascular assessment
Where do kidney tests fit into this discussion? Our kidney health guide explains creatinine, eGFR, and urine albumin, including what the 2026 guidance adds to the assessment of people with cardiovascular disease.
Explore further with MERHI ONE
The guide to LDL-C, ApoB, and Lp(a) expands the comparison and explains how cardiovascular risk informs treatment goals and clinical decisions.