ApoBg/L
Number of atherogenic particles
Also known as: Apolipoprotein B
Typical optimal range
0.55–1.4 g/L
Reported values typically fall between 0.55 and 1.4 g/L, with lower levels generally considered more favourable, though exact reference ranges vary between laboratories and should be interpreted alongside your lab's own guidance. These figures are indicative — the range printed on your own lab report is the definitive one for your results.
Lipid management in the UK is guided by NICE guideline NG238 (Cardiovascular disease: risk assessment and reduction, including lipid modification), which increasingly acknowledges ApoB as a clinically informative marker alongside standard lipid measurements.
What is ApoB?
Apolipoprotein B (ApoB) is a protein that sits on the surface of every atherogenic lipoprotein particle in the bloodstream — including LDL, VLDL, and Lp(a). Because there is exactly one ApoB molecule per particle, measuring it gives a direct count of the total number of these potentially harmful particles circulating in your blood. This makes ApoB a particularly useful marker of cardiovascular risk, as two people can have the same LDL cholesterol reading but very different particle counts — and it is the particles themselves that can lodge in artery walls and drive plaque formation.
What a high ApoB means
A raised ApoB suggests a higher number of atherogenic particles in your blood, which is associated with increased cardiovascular risk — it is a prompt to look more closely at your overall lipid picture and risk profile, not a diagnosis of any condition.
- Diet high in saturated fat. Saturated fat found in fatty meat, full-fat dairy, and ultra-processed foods stimulates the liver to produce more LDL and VLDL particles, directly raising ApoB. Shifting towards unsaturated fats — from oily fish, olive oil, and nuts — is one of the most well-supported dietary changes for lowering it.
- Insulin resistance and metabolic conditions. Conditions such as type 2 diabetes, metabolic syndrome, and obesity are strongly associated with raised ApoB, partly because insulin resistance drives overproduction of VLDL particles by the liver. Managing blood sugar and weight can have a meaningful effect on particle numbers.
- Genetic lipid disorders. Familial hypercholesterolaemia (FH) and other inherited lipid disorders can cause significantly elevated ApoB independent of diet or lifestyle. FH is underdiagnosed in the UK, and a GP can refer to a specialist lipid clinic if this is suspected.
ApoB should be interpreted alongside total cholesterol, LDL, triglycerides, and your individual cardiovascular risk score rather than in isolation; a single raised result warrants repeat testing before any decisions are made.
What a low ApoB means
A low ApoB is generally considered protective and is not usually a cause for clinical concern in otherwise healthy people.
Very low ApoB can occasionally be seen with rare inherited conditions such as abetalipoproteinaemia or with severe malnutrition, but these are uncommon and would typically present with other abnormalities — your GP can investigate if there is a clinical reason to do so.
Should I be worried?
A single ApoB result outside the expected range is useful information but rarely the full picture on its own — results can vary between laboratories and are best interpreted alongside your other lipid markers, your personal and family history, and an overall cardiovascular risk assessment. If your ApoB is raised, a GP may want to repeat the test, check a full fasting lipid panel, assess your blood pressure and blood glucose, and calculate your 10-year cardiovascular risk using a validated tool such as QRISK3. For people already known to have cardiovascular disease or very high risk, more specific targets may apply. Bring your results to your next GP appointment so they can be interpreted in the context of your full health picture.
What actually helps
The same lifestyle changes that lower LDL cholesterol tend to reduce ApoB by decreasing the number of atherogenic particles the liver produces and releases.
- Reduce saturated fat intake. Replacing saturated fats with unsaturated fats — for example swapping butter for olive oil or choosing oily fish over fatty processed meat — is one of the most evidence-backed ways to lower atherogenic particle numbers. This is a cornerstone of NHS dietary advice for cardiovascular health.
- Increase dietary fibre. Soluble fibre, in particular, binds bile acids in the gut and prompts the liver to draw cholesterol from the blood to make more, which can reduce circulating lipoprotein particles. Aiming for the recommended 30g of fibre per day from varied sources is a practical starting point.
- Regular physical activity. Aerobic exercise — such as brisk walking, cycling, or swimming — improves insulin sensitivity and helps the body clear triglyceride-rich particles more efficiently, both of which can contribute to a lower ApoB. The NHS recommends at least 150 minutes of moderate activity per week.
- Achieve or maintain a healthy weight. Excess weight, particularly around the abdomen, is associated with insulin resistance and increased VLDL production. Even modest weight loss can meaningfully reduce ApoB in people with overweight or obesity.
There is good supporting evidence for several specific foods and food groups in reducing atherogenic particle burden.
Oats and barley
Rich in beta-glucan, a soluble fibre with well-replicated evidence for lowering LDL cholesterol and reducing atherogenic particle production.
Oily fish (salmon, mackerel, sardines)
High in omega-3 fatty acids, which help reduce triglyceride-rich VLDL particles and have broader anti-inflammatory cardiovascular benefits.
Legumes (lentils, chickpeas, beans)
Provide soluble fibre and plant protein, helping to displace saturated fat in the diet while actively supporting lower LDL and particle counts.
Nuts (especially almonds and walnuts)
Rich in unsaturated fats, plant sterols, and fibre; regular nut consumption is associated with modest reductions in LDL and cardiovascular risk in multiple large studies.
Olive oil
A key source of monounsaturated fat and polyphenols; replacing saturated fat with olive oil is associated with a more favourable lipid profile and lower cardiovascular risk.
Fruit and vegetables
Contribute soluble fibre, antioxidants, and potassium, and help crowd out energy-dense, saturated-fat-rich foods — supporting an overall dietary pattern linked to lower cardiovascular risk.
Track your own ApoB
Upload a lab PDF and Better Days trends ApoB over time, flags it when it drifts, and suggests foods that help.
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Sources & further reading
These are reputable UK health resources for further reading. This page is written to be consistent with their guidance but is not a substitute for them.
For information only — not medical advice, and not individually reviewed by a clinician. Reference ranges vary by lab and individual. Discuss any results with a qualified clinician before making changes.