A cholesterol test result can look like a confusing list of numbers: total cholesterol, LDL, HDL and triglycerides. Each tells you something different about your heart and blood vessel health. This guide explains what each number means, which ranges are considered healthy for adults and what you can do to improve them.
What is cholesterol?
Cholesterol is a waxy, fat-like substance your body needs to build cells and make hormones and vitamin D. Your liver makes all the cholesterol you need; the rest comes from food.
Cholesterol travels through the blood attached to proteins called lipoproteins. Too much of the wrong kind can build up in artery walls as plaque, narrowing the arteries and raising the risk of heart attack and stroke. This process is called atherosclerosis.
The numbers on a lipid panel
A standard blood test called a lipid panel usually reports four values.
LDL cholesterol (“bad” cholesterol)
Low-density lipoprotein carries cholesterol to the tissues. High levels lead to plaque build-up. For LDL, lower is generally better.
HDL cholesterol (“good” cholesterol)
High-density lipoprotein helps carry extra cholesterol away from the arteries back to the liver. Higher levels are linked with lower heart risk.
Triglycerides
These are the most common type of fat in the body. They store extra energy from food. High levels, often linked to excess calories, sugar and alcohol, add to heart risk and very high levels can cause pancreatitis.
Total cholesterol
This is the overall amount of cholesterol in the blood, including LDL, HDL and other lipid particles.
Some reports also include non-HDL cholesterol (total cholesterol minus HDL), which captures all the “bad” particles together.
Healthy ranges for adults
These are commonly used reference ranges for adults, in milligrams per deciliter (mg/dL), based on guidance from the National Heart, Lung, and Blood Institute and earlier national cholesterol guidelines:
| Measure | Desirable | Borderline | High |
|---|---|---|---|
| Total cholesterol | Below 200 | 200–239 | 240 or higher |
| LDL cholesterol | Below 100 (optimal) | 130–159 | 160–189 (high), 190+ (very high) |
| Triglycerides | Below 150 | 150–199 | 200–499 (high), 500+ (very high) |
For HDL, below 40 mg/dL in men or below 50 mg/dL in women is considered low, and 60 mg/dL or higher is considered protective.
An LDL of 100–129 mg/dL is often described as near optimal. Your personal LDL goal may be lower, for example if you already have heart disease, diabetes or other major risk factors.
Why your overall risk matters more than one number
Doctors no longer look at cholesterol in isolation. They estimate your chance of a heart attack or stroke over the next 10 years using factors such as:
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- Age and sex
- Blood pressure
- Smoking
- Diabetes
- Kidney function
- Cholesterol levels
The result helps decide whether lifestyle changes alone are enough or whether medicine is recommended. Some people may also be offered tests such as lipoprotein(a) or a coronary artery calcium scan to refine their risk.
What raises cholesterol
- Diets high in saturated fat and trans fat
- Excess weight
- Physical inactivity
- Smoking, which lowers HDL
- Type 2 diabetes and insulin resistance
- An underactive thyroid
- Certain medicines
- Genetics, especially familial hypercholesterolemia, an inherited condition that causes very high LDL from a young age
An LDL of 190 mg/dL or higher in an adult should prompt a discussion about familial hypercholesterolemia and early treatment.
How to improve your numbers
Eat for your heart
- Replace saturated fats (fatty meats, butter, full-fat dairy, coconut and palm oil) with unsaturated fats from olive oil, canola oil, nuts, seeds, avocado and fish.
- Avoid trans fats, found in some fried and commercially baked foods.
- Eat more soluble fiber from oats, barley, beans, lentils, apples and citrus fruits; it helps lower LDL.
- Choose fish, especially fatty fish, at least twice a week.
- Limit sugary foods, refined carbohydrates and alcohol, which raise triglycerides.
Get moving
Aim for at least 150 minutes of moderate activity a week. Exercise can raise HDL and lower triglycerides.
Reach a healthier weight
Even modest weight loss can lower LDL and triglycerides and improve HDL.
Quit smoking
Stopping smoking improves HDL and greatly lowers heart disease risk.
Cholesterol-lowering medicines
When lifestyle changes are not enough or your risk is high, medicines may be recommended:
- Statins are the most widely used and best-studied. They lower LDL and reduce the risk of heart attack and stroke.
- Ezetimibe reduces cholesterol absorption from the gut and is often added to a statin.
- PCSK9 inhibitors are injections that lower LDL substantially, typically for people at very high risk or with familial hypercholesterolemia.
- Other options include bempedoic acid and inclisiran.
For very high triglycerides, treatment may include prescription omega-3 medicines or other drugs, along with diet changes.
Most side effects are uncommon and manageable. If you notice muscle aches or other problems, talk with your clinician rather than stopping on your own.
How often to get tested
Adults are often advised to have their cholesterol checked every four to six years if their risk is low, and more often if they have risk factors or are on treatment. Children may be screened once between ages 9 and 11 and again between 17 and 21, or earlier if there is a strong family history.
Frequently asked questions
Do I need to fast before a cholesterol test?
Many people no longer need to fast. If your triglycerides are high or your clinician asks, you may be told to fast for 9 to 12 hours.
Can thin people have high cholesterol?
Yes. Genetics, diet and other conditions can cause high cholesterol at any weight.
Are eggs bad for cholesterol?
For most people, dietary cholesterol has a smaller effect on blood cholesterol than saturated and trans fats. Eggs can fit into a healthy diet in moderation.
The bottom line
Your lipid panel is a snapshot of heart risk. Aim for lower LDL and triglycerides and healthy HDL, but look at the whole picture with your clinician. A heart-healthy diet, regular activity and not smoking help everyone, and medicine can add strong protection when needed.
This article is for general information and is not a substitute for advice from a qualified healthcare professional.