Home
Contact Us

Cholesterol Made Clear: What Matters for Your Heart

Cholesterol is one of the most talked-about topics in heart health, yet also one of the most misunderstood. Many people feel anxious when they see an elevated cholesterol result, while others are unsure what the numbers actually mean. The truth is that cholesterol is not inherently bad, and a single result rarely tells the whole story.

Dr Primero Ng, Interventional Cardiologist

In this article, we break down what cholesterol really is, how it affects your heart, and how to interpret your results in a way that is clear, practical, and focused on your individual cardiovascular risk.

The short answer

High cholesterol usually means a raised LDL (“bad”) cholesterol, which builds up in artery walls over years and increases the risk of heart attack and stroke. Whether a result is “too high” depends on your overall cardiovascular risk, not a single number. Lipoprotein(a), a largely inherited type of cholesterol particle, adds to risk and is worth discussing with your doctor.

Written by Dr Primero Ng, MBBS (Hons), FRACP, FACC, FSCAI · Interventional Cardiologist, Perth · Reviewed October 2026

The Essentials

Cholesterol: What It Is and Why It Matters for Your Heart

Cholesterol is a natural, waxy substance found in every cell of your body. Despite its reputation, cholesterol is not inherently harmful and is essential for normal bodily function. Your liver produces most of the cholesterol you need, with a smaller amount coming from the foods you eat.

Cholesterol plays several important roles. It helps form and maintain cell membranes, serves as a building block for key hormones such as oestrogen, testosterone, and cortisol, and is required for the production of vitamin D and bile acids, which assist with fat digestion.

The link between cholesterol and heart health is more complex than many people realise. Not all cholesterol is “bad”, and understanding the different types of cholesterol is crucial for making informed decisions about your cardiovascular health.

Cholesterol attracts medical attention because of its role in atherosclerosis, the gradual build-up of plaque within the arteries that can lead to heart attacks and strokes. However, cholesterol is only one part of the overall cardiovascular risk picture. Its significance needs to be interpreted alongside other factors such as blood pressure, diabetes, smoking history, genetics, and lifestyle, within the context of your individual health profile.

Cholesterol Types

Different Types of Cholesterol Explained

Cholesterol moves through your bloodstream in particles called lipoproteins. Each type plays a different role in the body and has different implications for heart health. Understanding these differences can help you make sense of your cholesterol results and have more informed discussions with your healthcare team.

LDL Cholesterol

Often referred to as “bad” cholesterol, LDL carries cholesterol from the liver to tissues throughout the body, including the walls of the arteries. When LDL levels are too high, cholesterol can gradually build up in the artery walls, increasing the risk of heart attack and stroke over time.

Optimal level: generally below 2.6 mmol/L, with lower targets recommended for people at higher cardiovascular risk.

HDL Cholesterol

Often called “good” cholesterol, HDL helps transport excess cholesterol away from the arteries and back to the liver, where it can be processed and removed. Higher HDL levels are generally associated with a lower risk of heart disease.

Healthy level: generally above 1.0 mmol/L in men and above 1.3 mmol/L in women.

Triglycerides

Triglycerides are the main form of fat in the bloodstream and are used by the body for energy. When levels are elevated, particularly in combination with low HDL cholesterol, they are associated with a higher risk of cardiovascular disease.

Normal level: generally below 1.7 mmol/L.

advanced cholesterol markers

Advanced Cholesterol Markers: Looking Beyond the Basics

Standard cholesterol tests provide valuable information and are an important first step in assessing heart health. In some people, however, these results do not fully explain their cardiovascular risk. In these situations, advanced cholesterol markers can offer a more complete and personalised picture.

These tests are particularly helpful if you have a strong family history of heart disease, diabetes, elevated triglycerides, or if treatment decisions are not straightforward.

Non-HDL Cholesterol

Non-HDL cholesterol represents all cholesterol particles that can contribute to plaque build-up in the arteries. It includes LDL cholesterol as well as other harmful lipoproteins.

It is calculated by subtracting HDL cholesterol from total cholesterol and is especially useful when triglyceride levels are elevated.

Typical targets:

  • Below 3.4 mmol/L for most adults
  • Below 2.6 mmol/L for people at higher cardiovascular risk

Because it captures all atherogenic particles, non-HDL cholesterol is often a more reliable marker than LDL alone.

Apolipoprotein B (ApoB)

ApoB measures the number of cholesterol-carrying particles in the bloodstream. Each plaque-forming particle contains exactly one ApoB molecule, making this a very accurate indicator of cardiovascular risk.

In some people, ApoB can better reflect risk than LDL cholesterol, particularly when cholesterol particles are small or triglycerides are elevated.

Typical targets (European guidelines): below 1.0 g/L at moderate risk, below 0.8 g/L at high risk and below 0.65 g/L at very high risk.

ApoB is increasingly used to guide personalised treatment decisions.

Lipoprotein(a)

Lipoprotein(a), often written as Lp(a), is a genetically determined cholesterol particle that independently increases cardiovascular risk.

Unlike other cholesterol markers, Lp(a) levels are largely inherited and are not significantly affected by diet, exercise, or standard cholesterol medications.

Elevated level:

  • Above 125 nmol/L

People with high Lp(a) benefit from earlier risk assessment and more proactive management of other modifiable risk factors.

Risk Assessment

How Cholesterol Affects Your Cardiovascular Risk

Cholesterol levels provide important insight into heart health, but they do not tell the whole story. Your overall cardiovascular risk is shaped by a combination of factors, including age, blood pressure, diabetes, smoking history, and family background. Understanding how these elements interact allows cholesterol results to be interpreted in context, leading to more accurate risk assessment and more personalised care.

33%

Reduced Heart Attack Risk

Statin therapy can reduce myocardial infarction risk by approximately one-third in at-risk adults

22%

Stroke Prevention

Risk of stroke decreases with appropriate cholesterol management

1/250

Familial Hypercholesterolaemia

Affects about 1 in 250 people, causing markedly elevated cholesterol from birth

In Australia, your GP estimates your chance of a heart attack or stroke over the next 5 years using the Australian CVD Risk Calculator (AusCVDRisk). It combines your age, sex, blood pressure, cholesterol, smoking, diabetes and kidney function. This personalised risk assessment helps guide treatment decisions, with more intensive prevention strategies recommended for people at higher overall risk.

"Heart risk is driven by how long LDL cholesterol stays high, not just how high it gets. Early action lowers lifetime risk."

what causes high cholesterol

What Causes High Cholesterol?

High cholesterol rarely has a single cause. It most often reflects a combination of genetic predisposition, lifestyle factors, and, in some cases, underlying medical conditions. Understanding these contributing factors helps you and your healthcare provider develop an effective, personalised approach to managing your cholesterol and reducing long-term cardiovascular risk.

Genetic Factors

Some people are genetically predisposed to higher cholesterol levels. The most well-known inherited condition is familial hypercholesterolaemia (FH), which affects around 1 in 250 people. FH results from genetic changes that impair how the body clears LDL cholesterol, often leading to LDL levels 5.0 mmol/L or higher from a young age.

More commonly, cholesterol levels are influenced by the combined effect of multiple genetic variations, a pattern known as polygenic hypercholesterolaemia. This can result in mild to moderate, and sometimes more significant, cholesterol elevation, even in people who follow a healthy lifestyle.

Lifestyle Influences

Dietary patterns high in saturated fats, trans fats, and refined carbohydrates can raise cholesterol levels over time. Physical inactivity, excess body weight, and tobacco use can further worsen cholesterol levels and increase overall cardiovascular risk.

The encouraging news is that these factors are highly modifiable. Improving lifestyle habits forms the foundation of both cholesterol prevention and treatment, and even small, sustainable changes can lead to meaningful improvements in heart health.

Medical Conditions

Some medical conditions can raise cholesterol levels and should be considered before diagnosing a primary cholesterol disorder. Common causes include an underactive thyroid, kidney disease, diabetes, liver conditions, and certain medications, such as corticosteroids or some blood pressure treatments.

Identifying and treating these underlying factors can sometimes improve or normalise cholesterol levels, and may reduce or remove the need for long-term cholesterol-lowering medication.

Testing & Results

Understanding Your Cholesterol Test Results

Cholesterol testing usually starts with a standard lipid profile, which measures total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides. In most situations, testing can be performed without fasting, making it more convenient while still providing accurate and reliable results.

When Should Cholesterol Be Tested?

  • Adults aged 45 to 79 (from 35 with diabetes, and from 30 for Aboriginal and Torres Strait Islander people): a heart risk check that includes cholesterol.
  • Younger adults with risk factors: such as a family history of heart disease, diabetes, or other medical conditions
  • After starting or adjusting treatment: typically after 4 to 12 weeks to assess response
  • Ongoing monitoring: every 3 to 12 months, depending on individual risk and treatment goals

Cholesterol results should always be interpreted in the context of your overall cardiovascular risk rather than as isolated numbers. What is considered optimal for one person may be different for another, depending on factors such as age, medical history, and overall heart disease risk.

Beyond Standard Tests

Advanced cholesterol testing, such as ApoB or lipoprotein(a), is not required for everyone but can be helpful in certain situations. These tests may be considered if:

  • You have a family history of early heart disease
  • Your triglyceride levels are significantly elevated
  • Treatment decisions are unclear
  • Standard cholesterol results do not fully explain your overall cardiovascular risk

Your healthcare provider can advise whether these tests would add useful information in your individual situation.

Your Personalised Management Plan

There is no one-size-fits-all approach to managing cholesterol. Your plan should be tailored to your individual risk, preferences, and circumstances. A heart-healthy lifestyle forms the foundation for everyone, with medication added when appropriate based on your personal cardiovascular risk and goals.

1

Live Heart Healthy

Prioritise vegetables, fruits, whole grains, nuts, and lean proteins, especially fish. Limit processed foods, sugary drinks, and unhealthy fats. Aim for at least 150 minutes of moderate exercise each week.

2

Know Your Risk

Your overall heart risk is assessed using your age, cholesterol, blood pressure, diabetes status, and smoking history, not cholesterol alone.

3

Use Medications When Needed

For higher-risk individuals, cholesterol-lowering medication can significantly reduce heart attack and stroke risk. Treatment intensity is tailored to your personal risk.

4

Track Your Progress

Regular blood tests and follow-up visits confirm your plan is working and allow early adjustment if needed.

5

Adapt Over Time

Your plan evolves as your health changes, ensuring ongoing, personalised heart protection.


"Managing cholesterol works best when you and your cardiologist work together. Your choices and commitment make the difference."

Making Decisions Together

Your Cholesterol Treatment Options

When lifestyle changes alone aren't sufficient, medication can significantly reduce your cardiovascular risk. Statins are extensively studied and effective cholesterol-lowering drugs, with decades of evidence supporting their benefits in preventing heart attacks and strokes.

When Is Medication Recommended?

Cholesterol-lowering medication is recommended when the expected benefits clearly outweigh the risks. This decision is based on your overall cardiovascular risk, not cholesterol levels alone, and is guided by national and international guidelines.

  • An LDL cholesterol of 5.0 mmol/L or higher (untreated) in an adult should prompt assessment for familial hypercholesterolaemia (FH), using the Dutch Lipid Clinic Network criteria. If FH is confirmed, treatment is recommended regardless of calculated risk.

Medication is generally recommended if you: have had a heart attack, stroke or stent; have familial hypercholesterolaemia or moderate-to-severe kidney disease; or have a 5-year risk of 10% or more on the Australian calculator. It may be considered if your 5-year risk is 5–10%, especially with other risk factors such as a strong family history, raised Lp(a) or a positive calcium score. People with diabetes have their risk calculated from age 35.

1

Initial Assessment

A full review of your cardiovascular risk and a shared discussion about the best treatment options for you.

2

4–12 Weeks

First follow-up to check how well treatment is working and address any side effects or concerns.

3

Every 3–12 Months

Ongoing monitoring, tailored to your risk level and response to treatment.

4

Long-Term Care

An ongoing partnership with your healthcare team to keep your heart protected over time.

For GPs

  • Assess risk with AusCVDRisk (45–79; diabetes from 35; First Nations from 30). Not for FH or moderate-to-severe CKD, who are high risk. Recommend lipid-lowering at 10% or more 5-year risk; consider at 5–<10%. (MJA 2024)
  • Suspect FH with untreated LDL 5.0 mmol/L or higher, premature CHD (men under 55, women under 65) in the patient or a first-degree relative, or tendon xanthomata. Use the Dutch Lipid Clinic Network score; refer if 6 or more.
  • Before referral: non-fasting lipids, TSH, LFTs, eGFR and urine ACR, HbA1c, and one Lp(a) in nmol/L (not MBS-rebated). Exclude secondary causes.
  • PBS: statins and ezetimibe are Unrestricted Benefits. Evolocumab and inclisiran need a Streamlined Authority for HeFH or established ASCVD with LDL above PBS thresholds despite maximally tolerated statin plus ezetimibe. Bempedoic acid is not PBS-listed.
  • Monitoring: recheck lipids 4–12 weeks after a change, then every 3–12 months. No routine CK or LFT monitoring without symptoms. Established CHD: LDL below 1.8 mmol/L (ESC below 1.4 mmol/L).
  • Refer for suspected FH, LDL above target on statin plus ezetimibe, intolerance to two or more statins, triglycerides above 10 mmol/L, or high Lp(a) with premature CVD.

General information for referring practitioners. Check current MBS and PBS criteria before acting.

Take Charge of Your Heart Health

Understanding your cholesterol helps you reduce risk, make informed choices, and work confidently with your healthcare team to protect your heart.

Lifestyle Comes First

Healthy eating, regular activity, weight management, and avoiding tobacco are the foundation of heart health for everyone.

Personalised Care

Cholesterol management is tailored to you. Your risk, preferences, and circumstances guide decisions, not a single universal target.

Prevention Works

Strong evidence shows that lowering LDL cholesterol reduces heart attacks, strokes, and cardiovascular deaths in people at risk.

You’re Supported

Your healthcare team partners with you at every stage, from assessment to long-term follow-up and treatment adjustments.

Mildly elevated cholesterol in someone without other risk factors often requires only lifestyle changes and regular monitoring. In contrast, people with multiple risk factors or established heart disease may benefit from more intensive treatment. The most important step is understanding your personal risk and working in partnership with your healthcare provider to create a plan that is right for you.

"Understanding cholesterol empowers you to make personalised choices that protect your heart and reduce long-term risk."

Related reading

Questions about your cholesterol? Book a consultation with Dr Primero Ng (a GP or specialist referral is needed). GPs: refer a patient

© 2026 Dr Primero Ng. All rights reserved.
Consultant Interventional Cardiologist, Perth & Mandurah, Western Australia.
Information on this website is general in nature and does not replace individual medical advice.