What this marker measures
HDL is one of the few blood markers where higher is generally better (up to a point). Regular aerobic exercise is one of the most effective ways to raise HDL.
High or low: what it can mean
High HDL
Higher HDL is generally considered protective against cardiovascular disease. Very high HDL (above 100 mg/dL) can occasionally be seen with certain genetic conditions, but mildly high values are typically a positive finding.
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Low HDL
Low HDL may reduce the protective effect against artery disease. It is associated with physical inactivity, smoking, obesity, high triglycerides, and certain diets.
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Lifestyle considerations
- •Aerobic exercise is one of the most effective ways to raise HDL
- •Quitting smoking and reducing refined carbohydrates can also improve HDL levels
Frequently asked questions
What is HDL?
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HDL ("good" cholesterol) carries excess cholesterol away from arteries back to the liver for disposal, helping to protect against artery narrowing.
What does HDL measure?
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HDL is one of the few blood markers where higher is generally better (up to a point). Regular aerobic exercise is one of the most effective ways to raise HDL.
What does high HDL mean?
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Higher HDL is generally considered protective against cardiovascular disease. Very high HDL (above 100 mg/dL) can occasionally be seen with certain genetic conditions, but mildly high values are typically a positive finding.
What does low HDL mean?
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Low HDL may reduce the protective effect against artery disease. It is associated with physical inactivity, smoking, obesity, high triglycerides, and certain diets.
What supports healthy HDL levels?
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Aerobic exercise is one of the most effective ways to raise HDL. Quitting smoking and reducing refined carbohydrates can also improve HDL levels
Related biomarkers
Editorial note
LabTestly explains lab markers using plain-English educational content. Reference ranges may vary by laboratory and should be interpreted with a clinician.
Educational content · Editorially reviewed for clarity · Last updated
Common sources used for lab-test education
Not medical advice
This page is for general understanding only and does not replace medical advice from your clinician. Reference ranges can vary by laboratory, age, sex, pregnancy status, medications, and clinical context.