Total Cholesterol
A blood test measuring the total amount of cholesterol in the blood, including LDL, HDL, and VLDL, used to assess cardiovascular risk.
Last updated: April 10, 2026
Total cholesterol measures all the cholesterol circulating in the blood. A desirable level is below 200 mg/dL — levels above 240 mg/dL are considered high and may increase heart disease risk.
Why Is Total Cholesterol Tested?
Cholesterol is a waxy, fat-like substance found in every cell of the body. The body needs it to build cell membranes, produce hormones, and make vitamin D. However, too much cholesterol in the blood can build up in the walls of arteries, forming plaques that narrow and harden blood vessels — a process called atherosclerosis.
A total cholesterol test measures the combined amount of all types of cholesterol in the blood: LDL (low-density lipoprotein, often called "bad" cholesterol), HDL (high-density lipoprotein, or "good" cholesterol), and VLDL (very low-density lipoprotein). The formula is: Total Cholesterol = LDL + HDL + 20% of Triglycerides.
This test is almost always ordered as part of a lipid panel, which also breaks down the individual components. A healthcare provider may order a cholesterol test to:
- Screen for cardiovascular disease risk
- Monitor the effectiveness of cholesterol-lowering treatments
- Evaluate lipid levels before starting certain medications
- Assess overall metabolic health as part of routine checkups
The American Heart Association recommends cholesterol screening starting at age 20, repeated every 4–6 years for adults at average risk. People with risk factors such as family history, obesity, diabetes, or smoking may need more frequent testing.
Normal Reference Ranges
These thresholds are established by the National Cholesterol Education Program (NCEP) and endorsed by the American Heart Association. Ranges may vary by lab, age, sex, and testing method.
| Category | Range | Unit |
|---|---|---|
| Desirable | Below 200 | mg/dL |
| Borderline High | 200 – 239 | mg/dL |
| High | 240 and above | mg/dL |
| Children (Desirable) | Below 170 | mg/dL |
| mg/dL | mmol/L (International) |
|---|---|
| 200 mg/dL | 5.2 mmol/L |
| 240 mg/dL | 6.2 mmol/L |
Ranges may vary by lab, age, sex, and testing method. International units use mmol/L. To convert mg/dL to mmol/L, divide by 38.67.
What Does a High Total Cholesterol Level Mean?
A total cholesterol above 200 mg/dL is considered above the desirable range and may indicate an increased risk for cardiovascular disease. However, total cholesterol alone does not tell the full story — the balance between LDL, HDL, and triglycerides matters significantly.
Common causes of high cholesterol (hypercholesterolemia):
- Diet high in saturated fats and trans fats (red meat, full-fat dairy, fried foods, baked goods)
- Obesity and a sedentary lifestyle
- Familial hypercholesterolemia — a genetic condition causing very high cholesterol from birth
- Smoking, which lowers HDL and damages blood vessels
Less common causes:
- Hypothyroidism (underactive thyroid)
- Poorly controlled diabetes
- Kidney disease (especially nephrotic syndrome)
- Liver disease (certain types)
Temporary or medication-related causes:
- Pregnancy — cholesterol naturally rises significantly in the second and third trimesters
- Medications: thiazide diuretics, corticosteroids, some beta-blockers, and retinoids
- Recent high-fat meal (if non-fasting test)
Slightly elevated (200–239 mg/dL) is classified as borderline high and often responds well to lifestyle changes. Significantly elevated (240 mg/dL and above) may require medical evaluation, additional lipid testing, and possibly medication depending on overall cardiovascular risk.
What Does a Low Total Cholesterol Level Mean?
Low total cholesterol is usually not a concern, especially if levels remain above 120 mg/dL. In fact, lower cholesterol is generally associated with lower cardiovascular risk. However, very low cholesterol may sometimes point to an underlying condition.
Possible causes of very low cholesterol:
- Hyperthyroidism (overactive thyroid)
- Liver disease — the liver produces most of the body's cholesterol, so severe liver damage can reduce levels
- Malnutrition or malabsorption conditions (celiac disease, Crohn's disease)
- Certain cancers (some blood cancers and advanced cancers)
- Statin overtreatment — cholesterol-lowering medication may reduce levels more than intended
Some research has associated very low cholesterol (below 120 mg/dL) with an increased risk of hemorrhagic stroke, though this relationship is still being studied. A healthcare provider can help determine whether low cholesterol warrants further evaluation.
Factors That Can Affect Your Results
Cholesterol levels can fluctuate based on several factors beyond diet alone. Understanding these variables helps put a single test result into proper context.
- Fasting vs. non-fasting: Total cholesterol is only minimally affected by fasting status, but triglycerides (which factor into the total) can be significantly higher after eating. Many labs now accept non-fasting samples for initial screening.
- Recent illness or surgery: Cholesterol levels may drop temporarily during acute illness, infection, or after surgery. Testing is generally recommended at least 6 weeks after a major illness for accurate results.
- Pregnancy: Cholesterol rises significantly during the second and third trimesters, sometimes by 25–50%. This is a normal physiological change and levels typically return to baseline after delivery.
- Medications: Statins, fibrates, and niacin lower cholesterol. Hormonal birth control, corticosteroids, and some blood pressure medications may raise it.
- Seasonal variation: Some studies have found cholesterol levels tend to be slightly higher in winter months and lower in summer, possibly related to diet, activity levels, and vitamin D exposure.
- Age and menopause: Cholesterol levels tend to rise with age. In women, total cholesterol often increases notably after menopause due to declining estrogen levels.
- Diet in the days before testing: A significant dietary change in the days leading up to a test can temporarily affect results. For the most representative reading, maintaining normal eating patterns before the test is recommended.
Should I Be Concerned About My Total Cholesterol Level?
A single high cholesterol reading does not necessarily mean medication is needed or that heart disease is imminent. Many factors influence cardiovascular risk, and total cholesterol is just one piece of the puzzle.
Total cholesterol alone is actually an incomplete measure of heart health. What matters more is the breakdown between LDL, HDL, and triglycerides. For example, a person with a total cholesterol of 220 mg/dL might have high HDL (the protective type), which would make that number less concerning. Conversely, someone with a total cholesterol of 195 mg/dL but very high LDL and low HDL could still be at elevated risk.
Borderline results (200–239 mg/dL) often respond well to lifestyle modifications such as dietary changes, increased physical activity, and weight management. Many people in this range can improve their numbers without medication.
For very high total cholesterol (above 300 mg/dL), prompt follow-up with a healthcare provider is recommended. This level may indicate familial hypercholesterolemia or another condition that benefits from early treatment. A doctor may recommend a cardiovascular risk assessment to determine the best course of action.
Common Next Steps
If total cholesterol comes back above the desirable range, a healthcare provider may recommend several follow-up actions.
- Full lipid panel breakdown: If not already done, individual LDL, HDL, and triglyceride levels provide a much clearer picture of cardiovascular risk than total cholesterol alone.
- Repeat testing: A single reading may not reflect typical levels. Retesting in 4–6 weeks can confirm whether the result is consistent.
- Lifestyle modifications: Dietary changes (reducing saturated fat, increasing fiber and omega-3 fatty acids), regular exercise, weight management, and quitting smoking can all improve cholesterol levels. A healthcare provider can help tailor a plan to each individual.
- Cardiovascular risk assessment: Tools like the ASCVD (Atherosclerotic Cardiovascular Disease) risk calculator estimate 10-year heart disease risk using cholesterol along with age, blood pressure, diabetes status, and smoking history.
- Statin therapy discussion: For individuals at high cardiovascular risk or with very high LDL, a healthcare provider may discuss cholesterol-lowering medication such as statins.
- Related tests: LDL cholesterol, HDL cholesterol, triglycerides, and CRP (C-reactive protein) may be ordered to provide additional context about inflammation and lipid metabolism.
Frequently Asked Questions About Total Cholesterol
What is a normal total cholesterol level?
A desirable total cholesterol level is below 200 mg/dL (5.2 mmol/L). Levels between 200 and 239 mg/dL are considered borderline high, and 240 mg/dL or above is classified as high cholesterol. For children and teens, a desirable level is below 170 mg/dL.
Is high cholesterol dangerous?
High cholesterol itself does not produce symptoms, but over time it can contribute to plaque buildup in the arteries (atherosclerosis), raising the risk of heart attack and stroke. The overall risk depends on other factors including blood pressure, smoking status, diabetes, and family history. Total cholesterol is most meaningful when evaluated alongside LDL, HDL, and triglycerides.
Can diet alone lower cholesterol?
For many people, dietary changes can lower total cholesterol by 10–20%. Reducing saturated fat, eliminating trans fats, increasing soluble fiber, and eating more plant-based foods may all help. However, genetics play a significant role in cholesterol production, and some individuals may need medication even with an excellent diet.
What causes high cholesterol?
High cholesterol can result from a diet rich in saturated and trans fats, lack of physical activity, obesity, and smoking. Genetic conditions like familial hypercholesterolemia can cause very high levels from a young age. Medical conditions such as hypothyroidism, poorly controlled diabetes, and kidney disease may also raise cholesterol.
Does high cholesterol cause symptoms?
No. High cholesterol does not cause noticeable symptoms in the vast majority of cases, which is why it is sometimes called a "silent" condition. The only way to know cholesterol levels is through a blood test, typically as part of a lipid panel. Regular screening is the best way to catch elevated levels early.
How often should cholesterol be checked?
The American Heart Association recommends cholesterol screening every 4–6 years for adults aged 20 and older who are at average risk. People with elevated cholesterol, heart disease risk factors, or those on cholesterol-lowering medication may need testing more frequently, sometimes every 3–12 months.
Can stress affect cholesterol levels?
Yes. Chronic stress may raise cholesterol levels over time through increased cortisol production and stress-related behaviors like overeating or reduced physical activity. Acute stress can also cause temporary elevations. Managing stress through exercise, adequate sleep, and relaxation techniques may help improve cholesterol levels over time.
What is the difference between total cholesterol and LDL?
Total cholesterol is the sum of all cholesterol in the blood, including LDL ("bad" cholesterol), HDL ("good" cholesterol), and VLDL. LDL is just one component and is widely considered the most important predictor of cardiovascular risk. A person could have high total cholesterol due to high HDL, which is actually protective — so the breakdown matters more than the total number alone.
Do I need to fast for a cholesterol test?
Traditionally, a 9–12 hour fast was recommended before a lipid panel. However, recent guidelines suggest non-fasting tests are acceptable for total cholesterol and HDL screening. A healthcare provider may still request fasting if triglycerides or a calculated LDL level need to be measured most accurately.
Can exercise lower cholesterol?
Yes. Regular aerobic exercise can help raise HDL (good cholesterol) and may modestly lower LDL and total cholesterol. The cholesterol-lowering effect of exercise tends to be greatest when combined with dietary changes and a healthy weight. A healthcare provider can help determine what level of activity is appropriate for each individual.