- A lipid panel measures total cholesterol, LDL, HDL, and triglycerides. These are the four markers used for cardiovascular risk assessment.
- Approximately 2 in 5 Australian adults have elevated total cholesterol; the majority are unaware of it[1]
- LDL ("bad" cholesterol) is the primary target of cholesterol management; the lower the better for most people
- HDL ("good" cholesterol) is protective; higher levels are associated with lower cardiovascular risk
- Results should be interpreted alongside blood pressure, weight, family history, and lifestyle, not as standalone numbers
What is a lipid panel?
A lipid panel (also called a lipid profile) is a blood test that measures the fats and cholesterol circulating in your blood. It is the standard tool for assessing cardiovascular risk and is one of the most frequently requested blood tests in Australia.
A complete lipid panel includes four markers:
- Total cholesterol: the combined measure of all cholesterol in your blood
- LDL cholesterol (low-density lipoprotein): the primary risk marker for coronary artery disease
- HDL cholesterol (high-density lipoprotein): a protective marker; higher is generally better
- Triglycerides: a type of fat in the blood, closely related to diet, alcohol intake, and insulin resistance
Each marker tells a different part of the story. Total cholesterol alone is a poor guide. Someone with high total cholesterol driven by high HDL may be at lower risk than someone with only moderately elevated total cholesterol but low HDL and high triglycerides.
LDL cholesterol: the primary risk marker
LDL particles carry cholesterol from the liver to cells throughout the body. When LDL is elevated, excess cholesterol can accumulate in the walls of arteries, a process called atherosclerosis, progressively narrowing blood vessels and increasing the risk of heart attack and stroke.
For most people, LDL is the number that matters most in a lipid panel. Australian clinical guidelines generally use the following as reference points:
- Below 2.0 mmol/L: target for people with existing cardiovascular disease or very high risk
- Below 2.5–3.0 mmol/L: target for people with moderate cardiovascular risk
- Below 3.5 mmol/L: broadly acceptable for people at low overall risk
These thresholds are not diagnostic cutoffs; they are risk-management targets, and the appropriate target for you depends on your overall cardiovascular risk profile, not LDL alone.
A note on LDL calculation: Most Australian labs report calculated LDL using the Friedewald equation (derived from total cholesterol, HDL, and triglycerides). If triglycerides are very high (above approximately 4.5 mmol/L), this calculation becomes unreliable and direct LDL measurement may be needed. Your lab will flag this if relevant.
HDL cholesterol: the protective marker
HDL (high-density lipoprotein) is often called "good" cholesterol because it carries cholesterol back from the arteries to the liver, where it is processed and removed from the body. Higher HDL is generally associated with lower cardiovascular risk.
Australian reference ranges:
- Below 1.0 mmol/L (men) / below 1.2 mmol/L (women): low; associated with increased risk
- Above 1.5 mmol/L: considered protective
HDL is the one marker in a lipid panel where higher is better. Low HDL is a component of metabolic syndrome and is associated with insulin resistance, central obesity, and physical inactivity.
What raises HDL? Regular aerobic exercise is one of the most effective lifestyle levers for raising HDL. Stopping smoking, reducing refined carbohydrates, and moderate alcohol intake (current guidelines generally recommend against relying on alcohol for this purpose) are also associated with higher HDL.
Triglycerides: the diet-sensitive marker
Triglycerides are fats that circulate in the blood as a form of stored energy. After a meal, particularly one high in refined carbohydrates, fat, or alcohol, triglycerides rise significantly. This is why fasting is required for an accurate lipid panel.
Reference ranges:
- Below 1.7 mmol/L: optimal
- 1.7–2.3 mmol/L: borderline elevated
- Above 2.3 mmol/L: elevated; associated with cardiovascular and metabolic risk
- Above 5.6 mmol/L: very high; associated with risk of pancreatitis
Elevated triglycerides are closely associated with:
- High intake of refined carbohydrates and sugar
- Alcohol consumption
- Insulin resistance and type 2 diabetes
- Excess body weight (particularly central adiposity)
- Physical inactivity
Triglycerides respond well to lifestyle changes: reducing alcohol, refined sugar, and processed carbohydrates while increasing physical activity can produce meaningful reductions within weeks.
Non-HDL cholesterol: an often-overlooked marker
Some lipid reports include non-HDL cholesterol: calculated as total cholesterol minus HDL. This marker captures LDL plus other atherogenic (artery-narrowing) particles including VLDL, and is considered by some guidelines to be a better predictor of cardiovascular risk than LDL alone.
Non-HDL cholesterol target: generally below 3.0–3.5 mmol/L for most adults.
If your report includes this figure, discuss it with your GP alongside your LDL and other risk factors.
How are lipid results interpreted?
Lipid numbers do not exist in isolation. A GP or cardiologist will assess them alongside:
- Blood pressure
- Blood glucose and HbA1c
- Age and sex
- Smoking status
- Family history of early cardiovascular disease
- Body composition and waist circumference
- Other markers such as hs-CRP and homocysteine
Australian cardiovascular risk calculators (including the Australian Cardiovascular Risk Calculator used in general practice) combine these variables to estimate your 5-year and 10-year cardiovascular event risk. This risk score guides treatment decisions more meaningfully than any single number.
Context matters: A 35-year-old woman with LDL of 3.8 mmol/L, no family history, no smoking, normal blood pressure, and otherwise healthy markers may have a low overall cardiovascular risk. A 55-year-old man with the same LDL plus high blood pressure, low HDL, and a family history of early heart disease may have a high overall risk requiring treatment. The numbers are inputs; not the conclusion.
Lifestyle factors that influence lipids
Several modifiable lifestyle factors have good evidence for improving lipid profiles:
Dietary changes with the best evidence:
- Reducing saturated fat (red meat, butter, full-fat dairy, coconut oil): lowers LDL
- Replacing saturated fat with unsaturated fat (olive oil, nuts, avocado, oily fish): lowers LDL and raises HDL
- Increasing soluble fibre (oats, barley, legumes, psyllium): lowers LDL
- Reducing refined carbohydrates and sugar: lowers triglycerides
Exercise:
- Regular aerobic exercise (150+ minutes per week): raises HDL and lowers triglycerides
- Even moderate activity has measurable effects within weeks
Other factors:
- Stopping smoking: raises HDL
- Reducing alcohol: lowers triglycerides
- Weight loss (even modest amounts): improves all lipid markers
For people with significantly elevated LDL or overall high cardiovascular risk, lifestyle changes alone are often insufficient and medication (most commonly statins) is recommended alongside them.
FAQ
Do I need to fast before a lipid blood test?
Yes. Fasting for 8 to 12 hours is standard for a complete lipid panel. Triglycerides are particularly sensitive to recent food intake. Morning collection after an overnight fast is the most practical approach.
What is the difference between LDL and total cholesterol?
Total cholesterol is the combined measure of all cholesterol types, including LDL, HDL, and VLDL. LDL is the fraction most directly associated with cardiovascular risk and is the primary focus of treatment decisions.
What LDL level is considered high in Australia?
Australian guidelines generally consider LDL above 3.0 mmol/L elevated, though the appropriate target depends on your individual cardiovascular risk profile: assessed alongside blood pressure, family history, and other risk factors.
Can you lower cholesterol through diet alone?
Diet can meaningfully reduce LDL: reducing saturated fat and increasing soluble fibre has the strongest evidence. For most people, the effect is modest, and significantly elevated LDL typically requires medication alongside lifestyle changes.
How often should I have a lipid panel?
Australian guidelines recommend lipid testing every 5 years for adults with no known risk factors. If you are being treated or monitored for elevated cholesterol, your GP will advise more frequent testing.
