Cholesterol levels are a set of numbers from a blood test that measure different types of fats circulating in your bloodstream. A standard test, called a lipid panel, reports four main values: total cholesterol, LDL cholesterol, HDL cholesterol, and triglycerides. Each number tells a different part of the story, and understanding what they mean helps you gauge your risk for heart disease.
What a Lipid Panel Measures
Your body packages cholesterol into particles of different sizes and densities, and each type behaves differently. LDL (low-density lipoprotein) is often called “bad” cholesterol because it’s the main source of cholesterol buildup in artery walls. When there’s too much LDL in your blood, it can stick to the inside of your arteries, narrowing them over time and raising your risk of heart attack and stroke.
HDL (high-density lipoprotein) works in the opposite direction. HDL particles pick up excess cholesterol floating in your blood and carry it back to the liver, which breaks it down and sends it out of your body. HDL also helps fight inflammation and plays a role in preventing blood clots, which is why higher levels are considered protective.
Triglycerides are a different type of blood fat. Your body converts calories it doesn’t need right away into triglycerides and stores them in fat cells. High triglyceride levels often accompany high LDL and low HDL, compounding cardiovascular risk. There’s also VLDL (very low-density lipoprotein), a smaller component that carries triglycerides through the bloodstream. VLDL is typically estimated at about one-fifth of your triglyceride level and should stay below 30 mg/dL.
Total cholesterol is simply the sum of all these components. It gives a quick snapshot, but the breakdown underneath it matters more than the single number.
Healthy Ranges for Adults
For adults age 20 and older, here are the targets for each measurement (all in mg/dL):
- LDL cholesterol: Less than 100 mg/dL for both men and women
- HDL cholesterol: 40 to 80 mg/dL for men, 50 to 80 mg/dL for women. Below 40 (men) or below 50 (women) is considered low and increases risk.
- Triglycerides: Below 150 mg/dL is healthy. 150 to 199 is borderline high, 200 to 499 is high, and above 500 is very high.
- VLDL: Less than 30 mg/dL
These are general population targets. If you already have heart disease or are at elevated risk, your doctor will likely aim for tighter numbers, particularly for LDL.
How Risk Level Changes Your Target
The latest guidelines from the American Heart Association and American College of Cardiology (released in 2026) reintroduced specific LDL goals tied to your estimated 10-year risk of cardiovascular disease. The targets get progressively stricter as risk goes up.
If your 10-year risk is between 3% and 10%, the recommended LDL goal is below 100 mg/dL. If your risk is 10% or higher, the goal drops to below 70 mg/dL. For people who already have established heart disease, the target is even more aggressive: below 55 mg/dL. These guidelines also introduced non-HDL cholesterol goals (your total cholesterol minus HDL), which capture a broader picture of harmful particles. The non-HDL targets are below 130, below 100, and below 85 mg/dL for those same risk categories.
For people at low risk (below 3% over 10 years) with an LDL under 160, lifestyle changes alone are the first-line recommendation.
Cholesterol Levels in Children and Teens
Children and adolescents have slightly different thresholds. For anyone 19 or younger, total cholesterol below 170 mg/dL is considered acceptable, 170 to 199 is borderline, and above 200 is high. LDL should be below 110 mg/dL, with 110 to 129 considered borderline and above 130 considered high. Screening typically happens once between ages 9 and 11 and again between 17 and 21, though children with a family history of early heart disease or high cholesterol may be tested sooner.
Your Cholesterol Ratio
You may see your results reported as a cholesterol ratio, which is your total cholesterol divided by your HDL. A lower ratio signals better cardiovascular health because it means a larger proportion of your cholesterol is the protective HDL type. Higher ratios indicate more risk. However, many clinicians now prefer non-HDL cholesterol as a more useful single metric, since it captures all the potentially harmful particles in one number. You can calculate it yourself: subtract your HDL from your total cholesterol.
Fasting Before Your Test
Non-fasting blood draws are now routine for most lipid panels. Eating beforehand has minimal effect on total cholesterol, LDL, and HDL. The main exception is triglycerides, which rise temporarily after meals. If your non-fasting triglycerides come back at 350 mg/dL or higher, your doctor will likely ask for a repeat test after a 9- to 12-hour fast to get a more stable reading. Fasting tests are also preferred for people with known high triglycerides, those recovering from triglyceride-related pancreatitis, or those taking medications that can raise triglyceride levels.
A Newer Marker Worth Knowing
The latest guidelines also recommend that every adult have their lipoprotein(a) measured at least once. Lipoprotein(a), often written as Lp(a), is a genetically determined particle that increases cardiovascular risk independently of LDL. Levels at or above 125 nmol/L are associated with roughly a 1.4-fold increase in heart disease risk, and levels at or above 250 nmol/L double that risk or more. Unlike LDL, Lp(a) doesn’t change much with diet or exercise, so it’s largely a genetic card you’re dealt. Knowing your level helps you and your doctor decide how aggressively to manage the risk factors you can control.