What's the difference between ApoB and LDL cholesterol?

LDL cholesterol measures the cholesterol carried inside your LDL particles; ApoB counts the particles themselves. When the two disagree — a normal LDL but a high ApoB — ApoB is generally considered the better indicator of cardiovascular risk. ApoB isn't part of a routine cholesterol screen, so most people have never had it measured.

Why isn't lipoprotein(a) part of a standard cholesterol test?

Routine lipid panels and Medicare-rebated screening are built around traditional cholesterol markers. Lipoprotein(a) is largely genetic and is increasingly recognised as an independent risk factor, but it isn't yet part of standard screening, so unless you specifically request it or are being investigated for a problem, it usually isn't tested. It can be self-ordered as a standalone test or added to an advanced panel.

Which advanced heart markers can I get tested?

Beyond the standard lipid profile (total cholesterol, LDL, HDL, triglycerides), an advanced cardiovascular panel can include ApoB, ApoA1, homocysteine and high-sensitivity CRP. Vital Trend Health's Cardiovascular Risk Panel covers eight markers in one blood draw, with lipoprotein(a) available as a same-draw add-on — no referral, results in 24 hours.

Beyond Cholesterol: The Heart Markers Modern Medicine Probably Isn't Testing For (2026)

Beyond cholesterol: the heart markers modern medicine probably isn't testing for

A standard cholesterol test gives you four numbers: total cholesterol, LDL, HDL and triglycerides. They're useful, but they're a decades-old snapshot, and a growing body of research suggests they miss a lot of what actually drives heart disease. Markers like ApoB, lipoprotein(a), homocysteine and hs-CRP add a sharper, more complete read on cardiovascular risk — and most people have never had a single one of them measured.

None of this is fringe science; these markers are well established in cardiology research. They simply aren't part of the routine cholesterol screen most of us get.

What a standard cholesterol test covers — and what it doesn't

Marker	What it tells you	In a standard cholesterol test?
Total cholesterol	Top-line cholesterol number	Yes
LDL cholesterol	'Bad' cholesterol estimate	Yes
HDL cholesterol	'Good' cholesterol	Yes
Triglycerides	Blood fats	Yes
ApoB	Count of artery-clogging particles	Rarely
Lipoprotein(a)	Genetic, independent risk factor	Rarely
Homocysteine	Amino acid linked to artery damage	No
hs-CRP	Inflammation that drives plaque	Sometimes
ApoA1	Protective protein in HDL	Rarely

"Standard" refers to the routine lipid panel most Australians receive. Whether any advanced marker is right for you is a decision to make with your doctor.

The five markers worth knowing about

1. ApoB — a particle count, not a cholesterol estimate

Every artery-clogging particle in your blood carries exactly one ApoB protein, so an ApoB test is effectively a direct count of how many of those particles you have. LDL cholesterol measures the cholesterol inside the particles, which can read "normal" even when the particle count is high. When the two disagree, many researchers consider ApoB the better risk signal. Read the full ApoB explainer.

2. Lipoprotein(a) — the genetic risk factor you test once

Lp(a) is an LDL-like particle whose level is roughly 80–90% set by your genes. It barely moves with diet or exercise, and elevated Lp(a) is associated with higher cardiovascular risk independent of your cholesterol. Because it's largely fixed for life, one reading usually tells you what you need to know. Read the full Lp(a) explainer.

3. Homocysteine — a modifiable amino acid

Homocysteine is an amino acid your body clears using B vitamins (B12, folate, B6). When it builds up, elevated levels are associated with cardiovascular, stroke and cognitive risk. Unlike Lp(a), it's often modifiable, which makes it an actionable number to track. Read the full homocysteine explainer.

4. hs-CRP — the inflammation side of heart risk

High-sensitivity CRP measures low-grade inflammation, which plays a role in the plaque rupture behind many heart attacks, and it's independent of cholesterol. It's sometimes included in workups but rarely in a routine screen. Read the full CRP explainer.

5. ApoA1 — the protective counterpart

ApoA1 is the main protein in HDL, the "good" cholesterol that helps clear LDL from your bloodstream. Higher levels are generally considered protective, and the ApoB-to-ApoA1 ratio is used in research as a balance of risk versus protection.

Why aren't these tested as standard?

It's less about any single doctor and more about how routine screening works. Population-level guidelines and Medicare-rebated panels are built around the traditional lipid profile, which has decades of data behind it and is cheap to run at scale. Advanced markers like ApoB and Lp(a) have stronger supporting evidence than ever, but updating routine screening across a whole health system is slow. Unless you specifically ask, or you're already being investigated for a problem, these markers usually aren't measured. That's the gap a self-ordered advanced panel fills.

Who should consider an advanced cardiovascular panel?

A fuller panel tends to be most useful if you have a family history of heart attack, stroke or early heart disease; had a "normal" cholesterol result but want a clearer read on your risk; are in your 40s or 50s and want a baseline; have heard about ApoB or Lp(a) and want your numbers; or are tracking the impact of diet, training or medication over time. This is general information, not medical advice — whether these markers are right for you is a conversation to have with your doctor.

See the full picture with VTH — the Cardiovascular Risk Panel covers 8 markers including ApoB, ApoA1, homocysteine, CRP and a full lipid profile, with Lp(a) available as a same-draw add-on at checkout. No referral, results in 24 hours. View the Cardiovascular Risk Panel.