Old way vs new way of measuring cholesterol

Most people are told they have “high cholesterol” without much explanation of what that means or why it matters. In reality, cholesterol and the particles that carry it are not the same thing, and that distinction is why newer markers like ApoB are now measured alongside traditional cholesterol tests.

This article explains:

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First, what is cholesterol?

Cholesterol is a fat-like molecule your body can't do without. It is used to:

• Build cell membranes

• Produce steroid hormones

• Make vitamin D

• Make bile acids for digestion

Your liver makes most of the cholesterol you need. Some also comes from food.

Cholesterol is not harmful by default. Problems start when it ends up in the wrong place, particularly inside artery walls.

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What is a lipoprotein, and why do we need them?

Blood is mostly water, and cholesterol and fats don't dissolve in water. To move cholesterol safely through the bloodstream, the body packages it into lipoproteins: microscopic transport particles made of fat and protein.

Think of it like this:

• Cholesterol is the cargo

• Lipoproteins are the vehicles (or boats)

Different lipoproteins carry cholesterol in different directions and behave differently in the circulation. That's why cholesterol testing is really about lipoproteins, not cholesterol alone.

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The old way: traditional cholesterol markers

The traditional lipid panel looks at how much cholesterol is being carried, rather than how many particles are carrying it. These tests are still the backbone of NHS cardiovascular risk assessment.

Total cholesterol

Total cholesterol is the combined amount of cholesterol carried by all lipoproteins. It's useful for screening, but it doesn't show how cholesterol is split between protective and harmful particles.

LDL cholesterol (LDL-C)

LDL cholesterol reflects how much cholesterol is carried inside low-density lipoprotein particles. It is a central target in UK and European guidelines, it is strongly associated with cardiovascular events, and it responds well to lifestyle changes and statins.

Its limitation is that it measures cholesterol mass, not particle number.

HDL cholesterol (HDL-C)

HDL cholesterol measures cholesterol carried by high-density lipoproteins, which help remove excess cholesterol from artery walls. Higher HDL is generally associated with lower risk, but HDL function matters as much as the amount, and very high HDL isn't always protective.

HDL % of total cholesterol

This calculated marker shows how much of your total cholesterol comes from HDL. It gives a simple view of lipid balance and can highlight an unfavourable pattern even when total cholesterol looks acceptable.

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The limitation of the old way

Two people can have the same LDL cholesterol and very different cardiovascular risk. LDL-C tells you how much cholesterol is inside LDL particles. It doesn't tell you how many LDL-like particles are circulating, and more particles means more chances for cholesterol to get into artery walls over the years.

This gap matters most in people with:

• Insulin resistance or metabolic syndrome

• High triglycerides

• Fatty liver disease

• A strong family history of early heart disease

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The new way: ApoB and particle counting

What ApoB measures

Apolipoprotein B (ApoB) is a structural protein found on every atherogenic lipoprotein: LDL, VLDL, IDL and lipoprotein(a). Each of these particles carries exactly one ApoB molecule.

That makes ApoB a direct count of the particles that can drive plaque, rather than a measure of how much cholesterol they contain. LDL cholesterol tells you how much cargo is being carried. ApoB tells you how many boats are on the river.

Why ApoB matters

Cardiovascular risk is driven by how often artery walls are exposed to atherogenic particles over time. Large genetic studies, population cohorts and meta-analyses consistently show that:

• ApoB predicts cardiovascular events at least as well as LDL-C, and often better

• Lowering ApoB lowers the risk of heart attack and stroke

• LDL-C and ApoB can disagree, and when they do, ApoB can reveal risk that LDL-C misses

Many preventive cardiologists now use this particle-based view, focusing on cumulative lifetime exposure rather than short-term thresholds.

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A real example: ApoB in someone who felt fine

Stride founder Andrew Steele spent most of his adult life as an Olympic athlete, where training and nutrition were part of the job. By his forties, life looked different: two children, a move of house and country, a start-up to build, less training and more stress. He felt fine. His blood results said otherwise.

His first panel showed a CRP (an inflammation marker) of 1.39, higher than he expected, along with raised LDL cholesterol, an ApoB level he wasn't comfortable with and folate below the optimal range. LDL and ApoB were both up, which suggested an early pattern rather than a one-off lab quirk.

He kept the changes deliberately simple:

• Running twice a week instead of once. Regular aerobic exercise improves insulin sensitivity and how the body handles triglycerides, which affects how many ApoB-carrying particles the liver releases.

• Adding fibre to meals. Rather than cutting foods out, he added fibre, which helps the body clear cholesterol and steadies triglycerides after eating.

• Eating more protein. This helped with appetite, steadier energy and glucose control (more on that in nutrition by addition).

• Addressing low folate with a methylated B vitamin.

Three months later he retested. His inflammation marker had dropped, folate had improved, ApoB had come down and LDL cholesterol was trending down. He couldn't have felt any of those changes. Without retesting, there was no way to know whether the new habits were working.

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Old way vs new way: comparison table

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NHS perspective vs modern prevention

The NHS approach prioritises cost-effective population screening, LDL-C and non-HDL cholesterol, and risk calculators to guide treatment. That works well for most people.

Preventive cardiology adds another question: how many atherogenic particles has this person been exposed to over a lifetime? ApoB helps answer it, especially when standard cholesterol tests underestimate risk.

This isn't a replacement model. The strongest assessments combine LDL-C, non-HDL cholesterol, ApoB, inflammatory markers and metabolic context.

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FAQs

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The bottom line