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Doctor's Assessment Included

Every result includes a professional assessment from a BIG-registered doctor. For treatment decisions, discuss your results with your GP.

Cardiovascular

HDL cholesterol levels: what do they tell you about your vascular protection?

HDL cholesterol is a cornerstone of cardiovascular health screening. Regular monitoring helps assess your heart's protective factors and guide preventive action.

Reference Ranges

Male
mmol/l
Low > 1 Normal
Female
mmol/l
Low > 1.3 Normal

Reference ranges may vary between laboratories. When you order a test, a BIG-registered doctor assesses your personal results in context. For treatment decisions, discuss your results with your GP.

What It Measures

This test measures the concentration of HDL cholesterol (high-density lipoprotein) in your blood, expressed in mmol/L. The desirable value is above 1.0 mmol/L for men and above 1.3 mmol/L for women. The difference is because oestrogen raises HDL — after menopause, HDL decreases in women.

HDL is measured as part of a lipid profile. The total cholesterol/HDL ratio is often more clinically informative than the absolute HDL number. A ratio below 5 is desirable, below 4 is optimal.

Why It Matters

HDL has an active protective function: it removes excess cholesterol from vessel walls and transports it to the liver. This process is called reverse cholesterol transport and counteracts atherosclerosis. Low HDL is an independent risk factor for cardiovascular disease, even when LDL is normal.

Low HDL is often seen with metabolic risk factors: overweight, lack of exercise, smoking, insulin resistance, and type 2 diabetes. It is therefore a marker of overall metabolic health.

When to Test

HDL is routinely included in a lipid profile. It is useful for cardiovascular risk assessment, with overweight, diabetes, metabolic syndrome, and when monitoring statin use. Fasting (10–12 hours) is recommended when triglycerides are also being measured.

Symptoms

Low Levels

Low HDL (men < 1.0, women < 1.3 mmol/L) causes no symptoms itself but increases cardiovascular risk. It is often seen with overweight, a sedentary lifestyle, smoking, and insulin resistance.

High Levels

High HDL (above 1.5 mmol/L) is generally favourable. At very high values (above 2.5 mmol/L), there is rarely a genetic variant that makes HDL less functional, but for most people: the higher the HDL, the better.

Lifestyle Tips

Regular aerobic exercise is the most effective way to raise HDL — even thirty minutes of moderate exercise per day can make a difference. Stopping smoking raises HDL by an average of 5–10%. Weight loss with overweight also has a positive effect.

Diet-wise, unsaturated fats (olive oil, nuts, avocado, oily fish) help support HDL. Trans fats lower HDL and should be avoided. Moderate alcohol consumption appears to slightly raise HDL, but this does not outweigh the risks of alcohol.

Frequently Asked Questions

What is a normal HDL cholesterol level?
The desirable value is above 1.0 mmol/L for men and above 1.3 mmol/L for women. An HDL above 1.5 mmol/L is considered protective.
Why is HDL the "good" cholesterol?
HDL transports excess cholesterol from blood vessel walls back to the liver, where it is broken down. This counteracts atherosclerosis and reduces the risk of cardiovascular disease.
How do I raise my HDL?
The most effective measures are regular aerobic exercise, stopping smoking, and weight loss with overweight. Diet-wise, unsaturated fats (olive oil, nuts, oily fish) help. There are no effective medications specifically for raising HDL.
Do I need to fast before an HDL test?
HDL itself is not strongly affected by food intake. But because it is usually measured as part of a lipid profile (including triglycerides), fasting (10–12 hours) is recommended.
What is the cholesterol/HDL ratio?
This is your total cholesterol divided by your HDL. A ratio below 5 is desirable, below 4 is optimal. This ratio provides a better picture of your cardiovascular risk than total cholesterol or HDL individually.
Can HDL be too high?
In most cases, high HDL is favourable. At very high values (above 2.5 mmol/L), a rare genetic variant may make HDL less functional, but this is exceptional.

Test Products

This marker is included in the following test panels.