HDL Cholesterol (High-Density Lipoprotein)
Often called “good cholesterol,” HDL helps remove excess cholesterol from arteries and transport it back to the liver for processing.
Last updated: April 10, 2026
HDL cholesterol is often called “good” cholesterol because it helps remove LDL cholesterol from the arteries. Higher HDL levels are generally associated with lower cardiovascular risk — levels below 40 mg/dL in men or below 50 mg/dL in women are considered low.
Why Is HDL Cholesterol Tested?
High-density lipoprotein (HDL) is a type of lipoprotein that carries cholesterol away from the artery walls and back to the liver, where it can be broken down and removed from the body. This process, known as reverse cholesterol transport, is one of the main reasons HDL is considered protective against heart disease.
HDL cholesterol is measured as part of a standard lipid panel, which also includes LDL cholesterol, total cholesterol, and triglycerides. A healthcare provider may order an HDL test to:
- Assess overall cardiovascular risk
- Screen for dyslipidemia (abnormal cholesterol levels)
- Monitor the effectiveness of lifestyle changes or cholesterol-lowering medications
- Evaluate risk as part of a broader metabolic health assessment
- Calculate the total cholesterol to HDL ratio, a useful predictor of heart disease risk
The American Heart Association recommends that all adults age 20 and older have a lipid panel checked every 4–6 years, or more frequently for those with risk factors such as family history, obesity, diabetes, or smoking.
Normal Reference Ranges
HDL cholesterol levels are interpreted differently for men and women. Unlike most biomarkers, higher HDL is generally better. Ranges may vary by lab, age, sex, and testing method.
| Category | Range | Unit |
|---|---|---|
| Low (increased risk) — Men | Below 40 | mg/dL |
| Low (increased risk) — Women | Below 50 | mg/dL |
| Normal — Men | 40–59 | mg/dL |
| Normal — Women | 50–59 | mg/dL |
| Optimal (protective) | 60 and above | mg/dL |
| HDL Level | Interpretation |
|---|---|
| Below 40 mg/dL (men) / Below 50 mg/dL (women) | Low — increased cardiovascular risk |
| 40–59 mg/dL (men) / 50–59 mg/dL (women) | Acceptable but not optimal |
| 60 mg/dL and above | Optimal — considered protective |
| Above 100 mg/dL | Very high — may warrant further evaluation |
Note on units: In the United States, HDL cholesterol is measured in mg/dL. In many other countries, the unit mmol/L is used. To convert, divide mg/dL by 38.67 (for example, 60 mg/dL ≈ 1.55 mmol/L).
What Does HIGH HDL Cholesterol Mean?
High HDL cholesterol is generally considered protective against heart disease. An HDL level of 60 mg/dL or above is associated with a lower risk of cardiovascular events, and for many years higher HDL was viewed as universally beneficial.
However, the picture is more nuanced than simply “higher is always better.” Possible considerations with elevated HDL include:
- Generally protective — HDL in the 60–80 mg/dL range is associated with lower cardiovascular risk in most studies
- Very high HDL (above 100 mg/dL) — some research suggests diminishing protective benefit at extremely high levels, and certain genetic variants may produce HDL that is less functional
- Genetic factors — CETP (cholesteryl ester transfer protein) deficiency can cause very high HDL that may not provide the expected cardiovascular protection
- Medications — niacin and fibrates may raise HDL levels as a side effect of treatment
- Regular vigorous exercise — endurance athletes often have naturally high HDL, which is typically a sign of good cardiovascular health
- Moderate alcohol consumption — may raise HDL levels, though this does not mean alcohol is recommended for heart health
For most people, an HDL level in the 60–80 mg/dL range is a positive finding. Very high levels (above 100 mg/dL) may be worth discussing with a healthcare provider to rule out underlying genetic conditions.
What Does LOW HDL Cholesterol Mean?
Low HDL cholesterol is an independent risk factor for heart disease. When HDL levels are below 40 mg/dL in men or below 50 mg/dL in women, the body may be less effective at clearing excess cholesterol from the arteries.
Common causes and associations with low HDL include:
- Sedentary lifestyle — lack of regular physical activity is one of the most common causes of low HDL
- Smoking — damages blood vessels and directly lowers HDL cholesterol
- Obesity and metabolic syndrome — excess body weight, especially abdominal fat, is closely linked to low HDL
- Type 2 diabetes — insulin resistance often leads to low HDL and high triglycerides
- High triglycerides — there is an inverse relationship; as triglycerides rise, HDL tends to fall
- Poor diet — diets high in refined carbohydrates, trans fats, and processed foods may lower HDL
- Certain medications — beta-blockers, anabolic steroids, progestins, and benzodiazepines may reduce HDL levels
- Genetics — some people have genetically low HDL levels despite a healthy lifestyle
Low HDL is often part of a cluster of metabolic risk factors known as metabolic syndrome, which also includes high blood pressure, elevated triglycerides, high blood sugar, and excess abdominal fat. Addressing low HDL typically involves lifestyle changes as a first step.
Factors That Can Affect Your Results
HDL cholesterol levels can vary based on a number of modifiable and non-modifiable factors:
- Exercise level — regular aerobic activity can raise HDL by 5–10% or more; sedentary behavior lowers it
- Smoking status — smoking lowers HDL; quitting can improve levels within weeks to months
- Body weight — losing excess weight, particularly abdominal fat, may raise HDL levels
- Medications — statins, niacin, fibrates, and other drugs can affect HDL in different directions
- Alcohol intake — moderate consumption may raise HDL, but excessive drinking has negative cardiovascular effects overall
- Genetics — HDL levels are partly inherited; some people have naturally high or low levels regardless of lifestyle
- Age and menopause — women tend to have higher HDL than men before menopause; after menopause, HDL levels often decline
- Diet quality — replacing trans fats and refined carbohydrates with healthy fats (olive oil, nuts, fatty fish) may improve HDL
- Fasting status — while HDL itself is minimally affected by fasting, the lipid panel is often drawn fasting for accurate triglyceride and LDL measurements
Should I Be Concerned About My HDL Cholesterol Level?
A slightly low HDL level is common and does not necessarily mean heart disease is imminent. Many people with borderline low HDL live healthy lives, especially when other risk factors like blood pressure, LDL cholesterol, and blood sugar are well managed.
Results that may warrant closer attention:
- HDL below 40 mg/dL (men) or 50 mg/dL (women) — considered an independent risk factor for cardiovascular disease
- Low HDL combined with high LDL or high triglycerides — this combination significantly increases cardiovascular risk
- Low HDL as part of metabolic syndrome — when present alongside elevated blood sugar, high blood pressure, and abdominal obesity
- A declining trend over time — a drop in HDL levels from previous results may signal changes in lifestyle, weight, or metabolic health
HDL cholesterol is just one piece of the cardiovascular risk picture. A healthcare provider will consider HDL alongside LDL cholesterol, triglycerides, blood pressure, family history, age, and other factors to assess overall heart disease risk. Lifestyle changes such as regular exercise, quitting smoking, and improving diet quality are the most effective first-line approaches for raising HDL.
Common Next Steps
Depending on the result, a healthcare provider may recommend:
- Repeat lipid panel — to confirm the result and establish a baseline or track trends over time
- Full cardiovascular risk assessment — including blood pressure measurement, fasting glucose or A1C, and family history review
- Lifestyle modifications — increasing physical activity, quitting smoking, losing excess weight, and improving dietary fat quality
- Dietary changes — emphasizing healthy fats (olive oil, avocados, nuts, fatty fish) and reducing trans fats and refined carbohydrates
- Medication review — evaluating whether current medications may be affecting HDL levels
- Additional testing — CRP (inflammation marker), apolipoprotein testing, or advanced lipid particle testing in some cases
- Follow-up monitoring — lipid panel every 4–6 years for average-risk adults, or more frequently for those on treatment or with risk factors
Frequently Asked Questions
What is a good HDL cholesterol level?
An HDL level of 60 mg/dL or higher is considered optimal and may provide protective benefits against heart disease. For men, levels below 40 mg/dL are considered low, and for women, below 50 mg/dL is considered low. The higher the HDL within the normal range, the better the cardiovascular outlook tends to be.
Is higher HDL always better?
Not necessarily. While HDL levels of 60 mg/dL and above are generally considered protective, some research suggests that very high HDL (above 100 mg/dL) may not provide additional benefit. In rare cases, extremely elevated HDL could be linked to genetic conditions that produce less functional HDL particles.
How can HDL cholesterol be raised naturally?
Regular aerobic exercise is one of the most effective approaches. Other strategies include quitting smoking, maintaining a healthy weight, choosing healthy fats like olive oil and nuts over trans fats and refined carbs, and eating fatty fish rich in omega-3s. Even modest lifestyle changes may improve HDL over time. A healthcare provider can help tailor a plan to each individual.
What causes low HDL cholesterol?
The most common causes of low HDL include a sedentary lifestyle, smoking, obesity, type 2 diabetes, high triglycerides, and a diet rich in refined carbohydrates and trans fats. Certain medications such as beta-blockers and anabolic steroids may also lower HDL. Genetics can play a role as well.
What is the difference between HDL and LDL cholesterol?
HDL (high-density lipoprotein) is called “good” cholesterol because it carries excess cholesterol away from the arteries back to the liver. LDL (low-density lipoprotein) is called “bad” cholesterol because high levels can lead to plaque buildup in artery walls, increasing heart attack and stroke risk. Both are measured in a standard lipid panel.
Can exercise raise HDL cholesterol?
Yes. Regular aerobic exercise such as brisk walking, running, cycling, or swimming can help raise HDL. Research suggests that consistent moderate-intensity activity over time is generally needed to see meaningful improvement, and that higher-intensity or longer-duration exercise tends to have a greater effect. A healthcare provider can help determine what is appropriate for each individual.
Does smoking affect HDL cholesterol levels?
Yes. Smoking lowers HDL cholesterol and damages blood vessel walls, compounding cardiovascular risk. Quitting smoking may raise HDL levels within weeks to months, with continued improvement over time. This is one of the most impactful changes a person can make for heart health.
What does the total cholesterol to HDL ratio mean?
The total cholesterol to HDL ratio is calculated by dividing total cholesterol by HDL cholesterol. A ratio below 5 is generally considered desirable, and below 3.5 is optimal. This ratio provides a quick snapshot of the balance between “good” and “bad” cholesterol and is a useful predictor of cardiovascular risk.
Do I need to fast for an HDL cholesterol test?
HDL cholesterol itself is minimally affected by eating. However, because it is typically measured as part of a full lipid panel that includes triglycerides and calculated LDL, a 9–12 hour fast is often recommended for the most accurate overall results. A healthcare provider can advise whether fasting is necessary for a specific test order.
Can HDL cholesterol be too high?
In rare cases, very high HDL (above 100 mg/dL) may be associated with genetic conditions such as CETP deficiency. Some recent research suggests that extremely high HDL may not provide the same protective benefits and could even be linked to increased risk in certain populations. However, for most people, high HDL from exercise and healthy habits is a positive sign.
Sources
- American Heart Association. HDL (Good), LDL (Bad) Cholesterol and Triglycerides. heart.org.
- Mayo Clinic. HDL Cholesterol: How to Boost Your “Good” Cholesterol. mayoclinic.org.
- National Heart, Lung, and Blood Institute (NHLBI). Blood Cholesterol. nhlbi.nih.gov.
- MedlinePlus. HDL: The “Good” Cholesterol. U.S. National Library of Medicine.
- Framingham Heart Study. Risk factor prediction of coronary heart disease. Circulation.
Related Tests and Biomarkers
Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Reference ranges vary by laboratory and individual factors. Always discuss results with a qualified healthcare provider.