- A cholesterol test (lipid panel) usually reports total cholesterol, LDL, HDL and triglycerides.
- LDL (“bad”) cholesterol is the main driver of plaque in the arteries. The lower it is over your lifetime, the lower your heart risk.
- Your target depends on your overall risk, not just the number.
- Food changes can lower LDL by 10–20%; medicines such as statins lower it further when needed.
Cholesterol is a waxy fat that your body needs to build cells, make hormones and produce vitamin D. Your liver makes most of it; the rest comes from food. Because cholesterol does not dissolve in blood, it travels inside particles called lipoproteins. The type of particle, not cholesterol itself, is what decides whether it helps or harms your arteries.
High cholesterol has no symptoms. The only way to know your numbers is a simple blood test, and understanding the results is the first step to protecting your heart.
What each number means
Carries cholesterol into artery walls, where it builds plaque. Lower is better.
Helps carry cholesterol back to the liver. Higher levels are linked with lower risk, but raising HDL with drugs does not help.
Fats from food and from excess sugar, refined carbs and alcohol. High levels often signal insulin resistance.
Total minus HDL: all the potentially harmful cholesterol in one number. Useful when triglycerides are high.
A mostly inherited particle that raises heart risk. Worth testing once in adulthood.
Healthy ranges
General adult ranges (mg/dL, with mmol/L)
Markers show example results. People with heart disease, diabetes or high overall risk usually need a much lower LDL target, often under 70 mg/dL (1.8 mmol/L) or 55 mg/dL (1.4 mmol/L).
Reading an example report
Here is how a typical lipid panel might look for a 50-year-old who does not smoke and has normal blood pressure, and what each line tells you.
| Line on the report | Result | What it means |
|---|---|---|
| Total cholesterol | 220 mg/dL | Slightly high, but on its own it says little. Look at the parts. |
| LDL | 138 mg/dL | Borderline. Worth lowering with diet and activity; discuss overall risk. |
| HDL | 46 mg/dL | Acceptable for a man, low for a woman. |
| Triglycerides | 180 mg/dL | Borderline high; often improves with less sugar, refined carbs and alcohol. |
| Non-HDL | 174 mg/dL | Total minus HDL. Target is usually 30 mg/dL above your LDL target. |
Numbers can vary by 5–10% from one test to the next, so doctors look at trends and your overall risk rather than a single result.
Why LDL matters most
Genetic studies, long-term population studies and hundreds of clinical trials all point the same way: LDL cholesterol causes the plaque that leads to heart attacks and strokes, and lowering it reduces risk. In a pooled analysis of 26 trials, every 1 mmol/L (about 39 mg/dL) reduction in LDL cut major heart and stroke events by about a fifth. The effect grows the longer LDL stays low, which is why healthy habits from a young age matter so much.
How plaque builds up
Foods and habits that lower LDL
Approximate LDL lowering from each change
Approximate effects from ESC/EAS 2019 guidelines and meta-analyses; they add up when combined.
To lower triglycerides, cut sugary drinks, refined carbs and alcohol, eat oily fish, and move more. To support HDL, be active and do not smoke.
Cholesterol through life
Cholesterol tends to rise with age, and in women it often rises after menopause as estrogen falls. Because plaque builds up over decades, the total time your arteries are exposed to high LDL matters. Someone who keeps LDL moderately lower from their 30s onward may gain more protection than someone who lowers it sharply later in life. That is a good reason to know your numbers early and build heart-healthy habits now.
When medicine is needed
Your doctor looks at your cholesterol together with your age, blood pressure, blood sugar, smoking and family history to estimate your 10-year risk. If it is high, or if LDL is very high (190 mg/dL or 4.9 mmol/L or more, which can be a sign of familial hypercholesterolemia), a statin is usually recommended alongside lifestyle changes. Statins are among the most studied medicines in the world and lower LDL by 30–50% or more.
MythEggs are banned if you have high cholesterol.
FactFor most people, saturated fat and overall diet pattern matter more than dietary cholesterol. An egg a day fits a heart-healthy diet for most adults.
Common questions
Do I need to fast before a cholesterol test?
Usually not. Non-fasting tests are fine for most people. You may be asked to fast if your triglycerides were high before.
How often should I be tested?
Every 4–6 years for healthy adults, and more often if your numbers are raised, you take cholesterol medicine, or you have diabetes or heart disease.
Can thin people have high cholesterol?
Yes. Genes play a big role, and familial hypercholesterolemia affects about 1 in 250 people regardless of weight.
- LDL is the main cholesterol that drives plaque; lower is better.
- HDL, triglycerides, non-HDL and Lp(a) complete the picture.
- Your LDL target depends on your overall heart risk.
- Healthy fats, soluble fiber, plant sterols and activity lower LDL; statins help when needed.
- Related: 8 everyday habits for a healthier heart.
Sources
- Grundy SM, Stone NJ, Bailey AL, et al. 2018 AHA/ACC guideline on the management of blood cholesterol. Circulation. 2019;139(25):e1082–e1143.
- Mach F, Baigent C, Catapano AL, et al. 2019 ESC/EAS guidelines for the management of dyslipidaemias. Eur Heart J. 2020;41(1):111–188.
- Ference BA, Ginsberg HN, Graham I, et al. Low-density lipoproteins cause atherosclerotic cardiovascular disease: a consensus statement from the European Atherosclerosis Society. Eur Heart J. 2017;38(32):2459–2472.
- Cholesterol Treatment Trialists’ Collaboration. Efficacy and safety of more intensive lowering of LDL cholesterol: a meta-analysis of data from 170,000 participants in 26 randomised trials. Lancet. 2010;376(9753):1670–1681.
- Whitehead A, Beck EJ, Tosh S, Wolever TM. Cholesterol-lowering effects of oat β-glucan: a meta-analysis of randomized controlled trials. Am J Clin Nutr. 2014;100(6):1413–1421.
This article is for general education and is not a substitute for advice from your own doctor or healthcare team.