Normal Cholesterol Levels in Australia: What Your Numbers Mean

Normal cholesterol levels in Australia are usually given as a total cholesterol under 5.5 mmol/L, with LDL, HDL and triglycerides each read against their own targets. No single number suits everyone, though: your doctor reads your result alongside your blood pressure, age, smoking and family history. This guide explains normal cholesterol levels in Australia, what pushes them up, how high levels are treated and when to get checked.

Key takeaways

• Most Australian laboratories use a total cholesterol under 5.5 mmol/L and an LDL under 3.5 as general targets.
• HDL is the protective kind, so a higher HDL is usually better and a low one adds to your risk.
• Your own target depends on your overall heart risk, and it's lower if you've had a heart attack or stroke.
• Healthy eating, regular activity and not smoking all help, and some people also need cholesterol-lowering medicine.

What High Cholesterol Means for Your Heart

High cholesterol means too much of the fats called lipids is carried in your blood, and over years the extra builds up in your artery walls, raising your cardiovascular risk. Your report splits cholesterol into parts, because each one affects your heart differently.

These are the general figures behind normal cholesterol levels in Australia. Can HDL cholesterol be too high? A very high HDL doesn't seem to add more protection, and very high levels may even be linked with a higher risk.

Healthy Cholesterol Ranges for Australian Adults

Healthy cholesterol ranges for Australian adults depend on your overall cardiovascular risk rather than one cut-off. Low-density lipoprotein (LDL) cholesterol is the number that matters most, because it's the main cause of fatty build-up in the arteries. For someone at low risk, an LDL under 3.5 mmol/L is a common target; for someone at high risk, doctors usually aim lower; and after a heart attack or stroke, or with known cardiovascular disease, the usual aim is under 1.8, and often lower.

Normal cholesterol levels in Australia also vary a little between laboratories, so your report may flag a lipid result as high when your doctor is happy with it, or the other way round. Your liver makes most of the cholesterol in your blood, which is why food is only part of the story. The sections below cover what causes high cholesterol and how much lowering it helps, which depends on your cardiovascular health as a whole.

Common Causes of High Cholesterol

High cholesterol usually comes from a mix of your genes and the way you live. Foods high in saturated fat, such as fatty meats, butter, cream, coconut oil and many takeaway and packaged foods, raise LDL cholesterol the most, and trans fats do the same. Carrying extra weight, little activity, smoking and drinking too much alcohol add to it: smoking lowers protective HDL, and alcohol pushes triglycerides up.

Some people inherit high levels. Familial hypercholesterolaemia affects about 1 in 250 Australians and causes a very high LDL from birth, and an inherited particle called lipoprotein(a) raises cardiovascular risk whatever your diet; a one-off blood test can measure it. Other conditions push lipid levels up too, including diabetes, an underactive thyroid, kidney and liver disease, and some medicines, and cholesterol tends to rise with age and after menopause. If yours stays above normal cholesterol levels in Australia despite a healthy diet, your doctor may look for these causes, because cholesterol damages your blood vessels silently, with no symptoms.

LDL, HDL and Triglycerides on Your Report

Your report usually lists total cholesterol, LDL, HDL and triglycerides, and often non-HDL cholesterol and the ratio of your total to your HDL. LDL is usually worked out from the other numbers rather than measured directly, so a very high triglyceride result can make the LDL figure less accurate. HDL is high-density lipoprotein cholesterol, the protective kind that carries cholesterol back to your liver, and a higher HDL is usually better.

Triglycerides are a different kind of fat. They rise after a meal, with alcohol and sugary food, and with extra weight or diabetes. Triglycerides under 2.0 are the usual target on a test taken without fasting, and levels above 10 raise the risk of an inflamed pancreas and need prompt treatment. High triglycerides with a low HDL is a common pattern in people with insulin resistance, and cutting back on alcohol, sugar and refined carbohydrates brings triglycerides down faster than it changes LDL.

How High Cholesterol Is Treated

High cholesterol is treated by lowering your overall risk, not just the number. For most people that starts with changes to eating, activity, weight, smoking and alcohol, which often lower LDL by 5 to 15%. Whether you also need medicine depends on your five-year risk of a heart attack or stroke, and Australian guidelines recommend it for people at high risk, people with familial hypercholesterolaemia or chronic kidney disease, and anyone with heart or blood vessel disease.

Statins are the main cholesterol-lowering medicines, and they lower low-density cholesterol by about 30 to 50%; other tablets and, for people at very high risk, injections can be added. All of them are prescription only in Australia, and if you need one, your doctor chooses it with you and repeats a lipid test after you start. Your doctor watches your numbers over time: an LDL under about 1.8 mmol/L is a common aim after a heart attack, while for others the aim is set by their risk.

How to Keep Normal Cholesterol Levels in Australia

Keeping your cholesterol in a healthy range starts with what you eat. What is a normal cholesterol level in Australia? For most adults it's a total under 5.5 mmol/L with an LDL under 3.5, and results well above those are what doctors call high cholesterol levels. To stay in range, eat plenty of vegetables, fruit, wholegrains and legumes; choose healthy fats from olive oil, nuts, seeds, avocado and oily fish; and have less saturated fat from processed meats, butter, cream and fried or packaged foods. Eggs are fine for most people as part of a healthy diet.

Foods with added plant sterols, such as some margarines and milks, can bring LDL down by about 10% when you have them every day, and soluble fibre from oats, barley, legumes and psyllium helps too. Aim for at least 150 minutes of moderate activity a week, keep to a healthy weight, don't smoke, and keep alcohol within the national guidelines of no more than 10 standard drinks a week.

These lifestyle changes are the base of looking after your heart at any age, whether or not you also take medicine, and medicine and lifestyle work best together. A repeat lipid test after about three months shows how your numbers have changed, including your high-density lipoprotein cholesterol, and bringing your LDL down lowers your risk of heart disease.

Your Overall Heart Risk Score

Your overall heart risk score is your chance of having a heart attack or stroke in the next five years, and Australian doctors use it to decide how hard to treat your cholesterol. The calculator in Australia's guidelines combines your age, sex, smoking, blood pressure, total cholesterol and high-density lipoprotein (HDL), whether you have diabetes, and some other factors, such as where you live.

A risk under 5% is low, 5% to under 10% is intermediate, and 10% or more is high. Your doctor may move you up a level for things the calculator misses, such as a strong family history of early heart disease, a severe mental illness, a South Asian, Middle Eastern, Māori or Pacific Islander background, or a high calcium score on a heart scan. A high score usually means lifestyle changes plus cholesterol-lowering and blood pressure medicines; a low score usually means lifestyle changes alone, with another check in a few years.

When to Get Your Cholesterol Checked

Most adults should have their cholesterol checked as part of a heart health check from age 45, Aboriginal and Torres Strait Islander people from 30, and people with diabetes from 35. Earlier testing makes sense if a parent or sibling had a heart attack or stroke young, if a relative has familial hypercholesterolaemia, or if you have high blood pressure or kidney disease. Your doctor uses the result to assess your cardiovascular risk and decide how often to repeat it, usually every few years if your risk is low, and more often if it's higher or you've started treatment.

A lipid test is a simple blood test, and most people don't need to fast for it. If you've been told your LDL cholesterol is high and you're unsure what causes high cholesterol in your case, or whether lowering it with medicine is right for you, a GP can go through your numbers. Cholesterol itself causes no symptoms, so don't wait to feel unwell. Call 000 for chest pain or pain spreading to the arm, jaw or back, sudden breathlessness, or signs of a stroke such as a drooping face, arm weakness or slurred speech.

Summary

This guide covered normal cholesterol levels in Australia, what each part of your result means, the common causes and treatments, and how your overall heart risk sets your own target. If you'd like your numbers explained, or you're due for a check, a Medio GP can talk it through by phone, request a blood test, and send an eScript or a referral if they think it's right. Your own target matters more than the general normal cholesterol levels in Australia, so ask what yours is.

Frequently asked questions

Is a cholesterol level of 6.5 considered high?

Yes. A total cholesterol of 6.5 is above the general target of 5.5, so it's considered high, but what it means for you depends on your LDL, your HDL and your overall heart risk. What is total cholesterol? It's all the cholesterol in your blood added together, so a high total with a high HDL can matter less than it looks. What levels are normal, and when are they too high? Your doctor reads all your numbers together to tell you.

What is the normal range for triglycerides?

Triglycerides under 2.0 mmol/L are the usual target for adults. Levels between 2 and 10 are raised and often come down with less alcohol, sugar and refined carbohydrate, and levels above 10 need prompt medical care. What are healthy cholesterol and triglyceride levels? A healthy result pairs triglycerides under 2.0 with a total cholesterol under 5.5, an LDL under 3.5 and an HDL of 1.0 or more.

Can a doctor help with normal cholesterol levels?

Yes. A GP can request a lipid test, explain your result against normal cholesterol levels in Australia, work out your overall heart risk, and talk through lifestyle changes and medicine if you need it. Why is my cholesterol high if I'm eating healthy? It's often your genes, which set how much cholesterol your liver makes. A Medio GP can help by phone, with a blood pressure reading you take at home or a pharmacy.

How do I convert cholesterol from mmol/L to mg/dL?

Multiply by 38.67. A cholesterol result of 5.5 is about 213 mg/dL, and an LDL of 3.5 is about 135. For triglycerides, multiply by 88.57, so 2.0 is about 177 mg/dL. Australian laboratories report in mmol/L, while American sources use mg/dL. What is HDL cholesterol (good cholesterol)? It's the protective kind, and an HDL of 1.0 is about 39 mg/dL.

Is 7.8 very high cholesterol?

Yes. At 7.8, your total is well above the general target of 5.5 and is very high. A total of 7.5 or more, or an LDL of 5.0 or more, can point to familial hypercholesterolaemia, an inherited condition, so your doctor may ask about your family and suggest testing relatives. Which risks are associated with high cholesterol levels? Mainly heart attack and stroke, narrowed arteries in the legs and, over time, heart failure.

What are the new cholesterol numbers for 2026?

Cholesterol targets in Australia aren't one number for everyone. The national guideline for cardiovascular disease risk, updated in 2023, asks doctors to judge your cholesterol against your overall five-year risk rather than one cut-off, and to aim lower for people at high risk. What are healthy levels after a heart attack or stroke? Usually an LDL under 1.8, and often lower. Ask your doctor which target applies to you.