Heart Health · Preventive Testing · Cardiovascular Risk
You've had the blood test, and now you're looking at a page of numbers — total cholesterol, LDL, HDL, non-HDL, triglycerides — with no real sense of which ones matter or what “normal” actually means for you.
You're not alone in finding it confusing. This guide explains what each number represents, what the current UK thresholds are, and how often you should be retesting — including a genuinely important update to UK guidance that most cholesterol content online hasn't caught up with yet.
What actually gets measured
A standard cholesterol test — sometimes called a lipid panel — reports several separate numbers, not just one.
The sum of everything: the useful and the harmful cholesterol together. On its own, it's a starting point rather than a complete picture.
Carries cholesterol to your artery walls, where it can contribute to plaque build-up over time.
Does roughly the opposite — it helps carry cholesterol away from the arteries and back to the liver.
Simply your total cholesterol minus your HDL. It captures LDL along with several other harmful particle types in one combined number — which, as you'll see below, is why UK guidance has shifted towards using it as the main figure to watch.
A different type of fat in the blood, influenced by diet, weight, alcohol and how well diabetes (if present) is being managed.
What your numbers actually mean
As a general guide for adults without a diagnosed heart condition, here are the ranges most UK sources point to:
Why NICE now focuses on non-HDL, not just LDL
This is the part that's genuinely changed in recent years, and a lot of older content hasn't caught up with it.
What changed
NICE's updated lipid guidance (NG238) shifted the primary focus in UK clinical practice from LDL cholesterol towards non-HDL cholesterol as the main figure used to guide treatment for most people, particularly for primary prevention — meaning people who haven't yet had a heart attack or stroke. The reasoning is that non-HDL captures LDL plus other harmful particle types together, giving a fuller picture of your actual cardiovascular risk than LDL alone.
In practice, this means that if you start a statin, the aim your GP is usually working towards isn't a fixed LDL number — it's a substantial reduction in non-HDL cholesterol from wherever you started, generally more than 40%. If your results mention non-HDL prominently rather than LDL, that's this update in action, not an error or an unusual lab.
One practical upside: non-HDL doesn't require a fasting sample, so it can be measured at any time of day without the inconvenience of skipping breakfast beforehand.
Does high cholesterol have symptoms?
Almost always, no — and that's actually the reason testing matters in the first place, rather than waiting to feel unwell.
High cholesterol itself doesn't typically cause any noticeable symptoms. It doesn't make you feel tired, unwell, or different in any way you'd usually notice. The changes it contributes to happen quietly, inside artery walls, over years.
How often should you retest?
- Ages 40–74, no existing heart condition The NHS Health Check offers cholesterol testing as standard, roughly every five years. It's free, and if you haven't had one recently, it's a straightforward thing to book through your GP practice.
- Recently started a statin or made a significant lifestyle change Retesting around three months later is the usual approach — enough time for the change to show up in your results, without testing so soon that the numbers aren't yet meaningful.
- Existing risk factor — diabetes, family history, previous cardiovascular event Your GP will usually recommend testing more often than the standard five-year interval. If that sounds like your situation, ask directly rather than assuming the general schedule applies to you.
When family history matters
If a heart attack or stroke has happened to someone close to you at what felt like a young age — a parent, sibling, or grandparent, generally under 60 — that's something to mention to your GP explicitly, even if your own cholesterol results look unremarkable so far.
If you're curious whether a more detailed lipid marker might add anything beyond a standard test — particularly relevant with a family history of heart disease — our guide to the ApoB test covers when that additional test genuinely earns its place.
How Hea fits in
Remembering when your last cholesterol test was, and whether it's actually time for another one, is easy to lose track of between the standard five-year checks — particularly since nothing feels wrong in the meantime, which, as covered above, is exactly the point.
Hea can send a gentle reminder when a check-up is due, and helps you keep a simple record of things like diet changes, activity, or anything your GP has asked you to track alongside your results. It won't measure your cholesterol or replace the blood test itself — that's something only a proper lab test can do — but it can help make sure the follow-up doesn't quietly slip past without you noticing.
A gentle reminder for the check that's easy to forget
Hea can flag when your next cholesterol check is due, and help you keep a simple record of what's changed since your last one.
See how Hea worksFrequently asked questions
What is a good cholesterol level in the UK?
As a general guide for adults without diagnosed heart disease: total cholesterol below 5.0 mmol/L, non-HDL below 4.0 mmol/L, LDL below 3.0 mmol/L, and HDL above 1.0 mmol/L (men) or 1.2 mmol/L (women). Your personal target may be lower if you have existing cardiovascular disease, diabetes, or a strong family history — better discussed with your GP than judged against general figures alone.
Do I need to fast before a cholesterol test?
Not necessarily. Non-HDL cholesterol, which UK guidance now uses as the main figure, doesn't require fasting. If your test also works out LDL specifically, fasting may slightly improve the accuracy of that particular figure, but it won't change your non-HDL result.
What are the symptoms of high cholesterol?
There typically aren't any. High cholesterol doesn't usually cause noticeable symptoms on its own — it's a silent risk factor, which is exactly why regular testing matters rather than waiting to feel unwell. Symptoms like chest pain or breathlessness relate to cardiovascular disease that can develop over years, not to high cholesterol itself.
How often should I get my cholesterol tested?
Every five years through the NHS Health Check if you're between 40 and 74 with no existing heart condition. More often — around every three months — if you've recently started treatment or made a significant lifestyle change specifically to lower your cholesterol, or more frequently generally if you have diabetes, a family history of early heart disease, or an existing cardiovascular condition.
Sources
- Kenkre JS et al., Standardising lipid testing and reporting in the United Kingdom, Annals of Clinical Biochemistry, 2025
- NICE, Cardiovascular disease: risk assessment and reduction, including lipid modification (NG238)
- NHS, NHS Health Check — nhs.uk/conditions/nhs-health-check
- HEART UK — heartuk.org.uk
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