How to interpret your cholesterol results
What is “high cholesterol” really, and which numbers matter? Here is a plain-English guide to reading your total, LDL, HDL and non-HDL results — and what to do next.
A cholesterol blood test can look like a wall of numbers and initials. The good news is that only a few of them really drive decisions, and none of them are read in isolation — what matters is the whole picture, including your age, blood pressure and other risks. Here is how to make sense of your results.
What is high cholesterol, really?
Cholesterol is a fatty substance your body needs for healthy cells. The problem is not cholesterol itself but too much of the harmful type circulating in your blood, which can build up in artery walls and, over years, raise the risk of heart attack and stroke. “High cholesterol” usually means a raised level of the harmful (LDL) fraction, or a raised total, often alongside other risk factors. On its own it causes no symptoms — which is exactly why it is worth measuring.
The numbers on your report
A standard lipid profile usually shows:
- Total cholesterol — all the cholesterol in your blood added together. A useful headline, but too crude to judge risk on its own.
- LDL cholesterol (“non-HDL” is now often used instead) — the harmful type that furs up arteries. Lower is better.
- HDL cholesterol — the protective type that helps clear cholesterol away. Here, higher is generally better.
- Non-HDL cholesterol — total minus HDL. This captures all the harmful types together and is now the preferred measure for assessing and tracking risk.
- Triglycerides — another blood fat. High levels are linked to diet, alcohol, weight and diabetes.
- Total cholesterol to HDL ratio (TC:HDL) — a single figure that reflects the balance between harmful and protective cholesterol.
What counts as a healthy level?
As a general guide for a healthy adult, UK sources use these approximate targets:
- Total cholesterol: 5 mmol/L or below
- Non-HDL cholesterol: below 4 mmol/L
- LDL cholesterol: 3 mmol/L or below
- HDL cholesterol: above 1 mmol/L (men) or above 1.2 mmol/L (women)
- TC:HDL ratio: the lower the better — above about 6 suggests higher risk
These are guides, not hard cut-offs. If you already have heart disease, diabetes or a very high individual risk, your doctor will aim for lower LDL and non-HDL levels than these.
Why the numbers are only half the story
Cholesterol is never judged alone. Your GP looks at your overall cardiovascular risk using a tool such as QRISK, which combines your cholesterol with your age, sex, blood pressure, smoking status, weight, ethnicity, family history and conditions like diabetes. Two people with identical cholesterol can have very different risks — and very different advice — because of these other factors. That is why a slightly raised number on its own is rarely cause for alarm.
A strong family history of early heart disease or very high cholesterol can point to an inherited condition called familial hypercholesterolaemia, which is worth identifying early.
What to do with a raised result
For most people, the first steps are lifestyle changes that genuinely move the numbers:
- eat less saturated fat (fatty and processed meats, butter, cakes, biscuits) and more fibre, oily fish, fruit and vegetables
- be more physically active — aim for regular activity across the week
- reach and keep a healthy weight
- cut down on alcohol
- stop smoking, which harms your arteries and lowers protective HDL
If your overall risk is high enough, your GP may discuss a statin or another cholesterol-lowering medicine. Whether medication is right for you depends on your total risk, not one number — it is a shared decision worth talking through.
How GPLine can help
We offer cholesterol and other blood tests, and an unhurried appointment — in clinic or by video — to go through your results, work out your overall heart risk and agree a plan that fits you. You will get a clear explanation and, where helpful, an itemised invoice for insurance.
When to get help
Book an appointment with a GP if you have had a raised cholesterol result, a family history of early heart disease or very high cholesterol, or you simply want your heart risk assessed. Cholesterol itself causes no symptoms, so testing is the only way to know your levels.
Call 999 immediately if you have symptoms of a heart attack or stroke — for example central chest pain or tightness that may spread to the arm, neck or jaw; sudden breathlessness; or a sudden droop of the face, weakness in one arm, or slurred speech. These are emergencies and are not something to wait on.
This article is general information and not a substitute for a consultation about your own health.
Sources
- NHS — High cholesterol: https://www.nhs.uk/conditions/high-cholesterol/
- NHS — High cholesterol levels: https://www.nhs.uk/conditions/high-cholesterol/high-cholesterol-levels/
- NHS Health Check: https://www.nhs.uk/conditions/nhs-health-check/
- NICE — Cardiovascular disease: risk assessment and reduction, including lipid modification (NG238): https://www.nice.org.uk/guidance/ng238
