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Cardiovascular

Cholesterol/HDL Ratio: What This Number Says About Your Heart Risk

The cholesterol/HDL ratio is your total cholesterol divided by your HDL. A lower ratio points to a more favourable profile and a lower cardiovascular risk. Learn what your value can mean.

Doctor's Assessment Included

Reference Ranges

See the value that applies to you:

Choose male or female — this range differs by sex.

Enter your age — this range changes with age.

This range also depends on context such as cycle phase or sample material; the highlighted rows apply to your group.

Male Your group
mol/mol
Normal < 5 High
Female Your group
mol/mol
Normal < 5 High

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.

Check your own value

Cholesterol/HDL Ratio: what this test measures

The cholesterol/HDL ratio, sometimes called the HDL cholesterol ratio, is your total cholesterol divided by your HDL cholesterol. It is not a separate measurement but a ratio the lab calculates from two values already determined in your blood.

The number summarises at a glance how your 'unfavourable' and 'favourable' cholesterol relate to each other. HDL helps remove cholesterol from your blood vessels, so the more HDL you have relative to your total cholesterol, the lower the ratio.

A lower ratio points to a more favourable cholesterol profile. You can work out the ratio yourself with our cholesterol ratio calculator, and it is always assessed together with your individual results and with non-HDL cholesterol.

Cholesterol/HDL Ratio: why this value matters

The cholesterol/HDL ratio is a useful summary of your cardiovascular risk. Two people with the same total cholesterol can have a very different risk depending on their HDL. The ratio captures that difference.

A higher ratio means there is relatively little protective HDL compared with the rest of your cholesterol. This is associated with a higher long-term risk of artery narrowing and cardiovascular disease.

Because it is a ratio, it can be favourable even when one individual value sits just outside its range, or the other way around. That is why your doctor always looks at your whole lipid profile.

Cholesterol/HDL Ratio: when is testing worthwhile?

The cholesterol/HDL ratio is included when you have a cholesterol or lipid profile. This is often done during a general health check, when there is an increased risk of cardiovascular disease, or to monitor a previously found abnormality.

The ratio is also useful for tracking the effect of lifestyle changes or medication, because it reflects both a drop in 'unfavourable' cholesterol and a rise in HDL.

For a reliable lipid profile you are sometimes asked to fast; follow the instructions provided with your test.

Cholesterol/HDL Ratio: symptoms of a high or low value

Low Levels

A low cholesterol/HDL ratio is favourable and is not linked to any complaints. It usually reflects a healthy balance between your protective HDL and the rest of your cholesterol. A strikingly low ratio is not a cause for concern in itself and is assessed by your doctor in the context of your whole profile.

High Levels

A raised cholesterol/HDL ratio causes no symptoms by itself. An unfavourable cholesterol profile develops silently over many years and is usually only picked up through a blood test. Any complaints appear late, once artery narrowing already affects the heart or blood vessels. That is why measuring is worthwhile, especially when you feel well.

Cholesterol/HDL Ratio: lifestyle and this value

The same habits that raise your HDL and lower the rest of your cholesterol improve your ratio. Regular exercise, not smoking, a fibre-rich diet with unsaturated instead of saturated fats and a healthy weight all have an effect.

Keep alcohol moderate and watch saturated fat and sugars. A one-off result says less than the trend over time; discuss a raised ratio with your doctor, who looks at your full risk profile before changing anything about lifestyle or medication.

Cholesterol/HDL Ratio: frequently asked questions

What is a good cholesterol/HDL ratio?
A lower ratio is more favourable. A value below 5 is often seen as desirable and below 4 as favourable, but the exact target depends on your overall risk profile. Check the reference range on your own result and discuss it with your doctor.
How is the ratio calculated?
The ratio is your total cholesterol divided by your HDL cholesterol. The lab calculates it automatically from both values; it is not a separate blood draw.
Why is the ratio useful alongside individual cholesterol values?
It summarises the balance between your protective HDL and the rest of your cholesterol in a single number. Two people with the same total cholesterol can have a different risk, and the ratio captures that difference.
Is a high ratio dangerous?
A high ratio causes no symptoms on its own, but is associated with a higher long-term cardiovascular risk. Your doctor assesses it together with your blood pressure, lifestyle and other risk factors.
Do I need to fast for this test?
The ratio comes from your cholesterol and HDL values. A reliable lipid profile sometimes requires fasting; follow the instructions provided with your test.
Can I improve my ratio?
Yes. More exercise, stopping smoking, healthy fats and a healthy weight raise your HDL and lower the rest of your cholesterol, which improves the ratio. Discuss persistently high values with your doctor.

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Complete Blood Count (CBC) Leukocyte Differential ALP (Alkaline Phosphatase) ALT (Alanine Aminotransferase) AST (Aspartate Aminotransferase) Albumin Total Protein Bilirubin (Total) ApoB (Apolipoprotein B) Total Cholesterol LDL Cholesterol HDL Cholesterol Triglycerides Lipoprotein(a) Urea (BUN) Creatinine eGFR (Estimated Glomerular Filtration Rate) Calcium Bicarbonate Chloride Sodium Potassium Magnesium Cortisol DHEA-S Estradiol (E2) FSH (Follicle Stimulating Hormone) LH (Luteinizing Hormone) SHBG (Sex Hormone Binding Globulin) Total Testosterone Free Testosterone TSH (Thyroid Stimulating Hormone) Glucose (Fasting) HbA1c (Glycated Hemoglobin) Insulin (Fasting) HOMA-IR CRP (C-Reactive Protein) Homocysteine Ferritin Iron (Serum) Transferrin Transferrin Saturation Vitamin D (25-OH) Leptin Zinc Selenium Iodine Copper Free T3 (Triiodothyronine) Free T4 (Thyroxine) GGT (Gamma-Glutamyl Transferase)
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