LDL and HDL Testing: Understand Cholesterol and Heart Risk

What Is a Lipid Profile?

A lipid profile is a blood test that commonly measures the following parameters:

Interpret the results together with your broader health profile.

For example, the same LDL value may mean different things for two people, depending on their conditions. Conditions such as diabetes, previous cardiovascular disease, high blood pressure, kidney disease, smoking exposure, or a strong family history have a greater impact.

Understanding LDL and HDL: The Good vs. Bad Cholesterol

LDL and HDL are often called “bad” and “good” cholesterol, respectively. These labels are convenient for basic education but can oversimplify how lipoproteins work.

LDL Cholesterol

LDL particles carry cholesterol through the bloodstream. More exposure to atherogenic lipoproteins contributes to atherosclerotic plaque development and increases cardiovascular risk. Reducing LDL cholesterol can reduce cardiovascular events, particularly in people at elevated risk.

HDL Cholesterol

HDL participates in cholesterol transport and other biological processes. However, a higher HDL number should not automatically be interpreted as greater protection. Although higher HDL levels are associated with lower cardiovascular risk in many observational studies, clinical trials have not established that simply raising HDL reduces cardiovascular events. Therefore, HDL is not generally treated as an independent number that everyone should try to increase.

Are LDL and HDL Targets the Same for Everyone?

Technically not. The 2026 ACC/AHA guideline has returned to explicit LDL-C and non-HDL-C treatment goals, with lower targets for people at higher cardiovascular risk [2].

For example, the guideline recommends an LDL-C goal of less than 55 mg/dL for people at very high risk with established ASCVD. Other patients may have different goals depending on their risk category.

Therefore, values such as LDL below 100 mg/dL or HDL above 40-50 mg/dL should not be presented as universal “normal” targets for every adult. Your healthcare professional may consider the following parameters while interpreting your test results:

• Age
• Blood pressure
• Diabetes
• Smoking
• Kidney disease
• Family history
• Previous heart attack or stroke
• Existing atherosclerotic cardiovascular disease
• LDL and triglyceride levels
• Other risk-enhancing factors

The appropriate target is therefore patient-specific.

How Can You Support Healthy Cholesterol Levels?

Lifestyle changes remain an important part of cardiovascular risk management.

Step 1: Improve the Overall Quality of Your Diet

Rather than focusing on one “cholesterol-lowering food”, build a balanced dietary pattern that includes:

• Vegetables
• Whole fruits
• Pulses and legumes
• Whole grains
• Nuts and seeds
• Fish or other suitable protein sources
• Unsaturated fats in appropriate amounts

Foods containing soluble fibre, including oats, barley, beans, and some fruits, can contribute to a heart-healthy eating pattern. Replacing foods high in saturated fat with sources of unsaturated fat can also help improve the lipid profile.

Also read: Your Heart Health Matters: The Critical Role of Regular Cardiac Checkups

Step 2: Be Physically Active

Regular physical activity supports cardiovascular health and can improve several metabolic risk factors.

Depending on your health and fitness level, suitable activities may include the following:

• Brisk walking
• Cycling
• Swimming
• Dancing
• Strength training
• Other activities that you can maintain consistently

Exercise can affect LDL, triglycerides, HDL, blood pressure, body composition, and overall cardiovascular fitness, but responses vary by individual.

Step 3: Manage Weight When Appropriate

For people with overweight or obesity, gradual and sustainable weight management may improve several cardiovascular and metabolic risk factors. Responses aren’t identical for everyone, so focus on sustainable habits rather than a promised percentage improvement in cholesterol. A healthcare professional or dietitian can help you choose an appropriate approach.

Step 4: Avoid Tobacco

Smoking is an important cardiovascular risk factor independent of cholesterol. Stopping smoking can reduce cardiovascular risk over time. Rather than focusing only on whether HDL changes after quitting, the more important benefit is the overall reduction in cardiovascular risk associated with tobacco.

How to Increase HDL Cholesterol: Boosting Your Good Cholesterol

Raising HDL cholesterol requires consistent lifestyle modifications, including regular aerobic exercise, healthy fat intake, weight management, and tobacco cessation.

• A meta-analysis of 19 randomised controlled trials demonstrates that aerobic exercise increases HDL2 cholesterol by approximately 11% in adults [1]. Exercise for 150 minutes weekly at moderate intensity, or 75 minutes at vigorous intensity, to achieve measurable improvements in HDL within 12-16 weeks.
• Research shows omega-3 supplementation (1,800 mg daily EPA and DHA) increases large protective HDL particles by 28.7% while reducing small HDL particles [3]. Include salmon, mackerel, sardines, or fish oil supplements providing 1-2 grams of omega-3 fatty acids daily.
• Even small weight reductions significantly raise HDL levels while simultaneously lowering harmful LDL cholesterol and triglycerides. Focus on sustainable dietary changes rather than extreme restrictions to improve long-term HDL levels.
• Replace saturated fats with olive oil, avocados, nuts, and seeds containing heart-healthy fats that raise HDL cholesterol. Limit alcohol consumption to moderate levels; excessive drinking provides no cardiovascular protection despite claims about HDL benefits.

When Lifestyle Changes Aren’t Enough: Cholesterol Medications

Cholesterol-lowering medications are necessary when lifestyle modifications fail to achieve target levels after 3-6 months, or when patients present with very high cholesterol, existing cardiovascular disease, diabetes, or a strong family history, all of which require immediate pharmaceutical intervention.

• Statins represent first-line therapy, lowering LDL by 30-50% through inhibiting liver cholesterol production [4]. Patients require periodic blood tests to monitor liver function and muscle enzyme levels to detect potential complications during treatment.
• Cholesterol-absorption inhibitors block intestinal uptake, thereby reducing LDL by an additional 15-25% when combined with statins [5]. Minimal side effects make them suitable for elderly patients or those requiring gentler medication interventions.
• Fibrates primarily lower triglycerides by 30-50% while modestly raising HDL, and are prescribed when triglycerides exceed 500 mg/dL. Kidney function monitoring essential as fibrates accumulate in renal impairment, causing muscle toxicity and complications.
• Bile acid sequestrants and niacin serve as adjunct therapies when patients cannot tolerate primary medications. Niacin prescriptions have declined due to disappointing cardiovascular outcome trials, despite previously observed impressive HDL-raising effects.