Metabolic health
Metabolic Syndrome: The 5 Checks That Define It
Reviewed by a qualified clinician · analysed at UKAS-accredited UK labs (ISO 15189)
Last reviewed August 20267 min read
Every Helvy guide is written by our health editors, then checked by a qualified clinician before it goes live and re-checked as the science moves. We name clinical roles, not individuals, until each reviewer has agreed to be credited publicly. This is wellness guidance to help you understand your own data, not a diagnosis.
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Metabolic syndrome is a cluster of five measurements. You need a large waist plus any two of these: raised triglycerides, low HDL cholesterol, raised blood pressure, or raised fasting glucose. Two of the five are free to check at home. Two more sit on a standard cholesterol blood test.
Check your lipid markers → Build your testAs of August 2026. The numbers below come from the International Diabetes Federation consensus definition, the one most UK clinicians work from. A systematic review in Nature Communications on 6 December 2025 found global prevalence had roughly doubled since 2000. That is why the phrase is suddenly everywhere.
1. What is metabolic syndrome?
It is not a disease you catch. It is a label for several risk markers turning up together. The NHS puts it plainly.
“Metabolic syndrome is the name for a group of health problems that put you at risk of type 2 diabetes or conditions that affect your heart or blood vessels.”
— NHS, Metabolic syndrome
The awkward part is the next line on that page. The NHS also says you may have no symptoms at all. Nothing hurts. Nothing feels different. The markers move quietly for years, which is the whole reason anyone measures them.
How common is it? Common enough to be unremarkable. The Nature Communications review estimated worldwide prevalence at 31.0% of women and 25.7% of men by 2023, up from 14.7% and 9.0% in 2000. In North-Western Europe the modelled figures were higher still.
2. What are the five checks, and how many do you need?
The International Diabetes Federation definition works like a lock with two keys. Central obesity is compulsory. Then you need any two of the remaining four.
| Check | Threshold | How it is measured |
|---|---|---|
| Waist (required) | 94cm or more in men, 80cm or more in women, for people of European descent | Tape measure |
| Triglycerides | 1.7 mmol/L or above | Blood test |
| HDL cholesterol | Below 1.03 mmol/L in men, below 1.29 mmol/L in women | Blood test |
| Blood pressure | 130/85 mmHg or above, or already treated for high blood pressure | Home monitor or pharmacy |
| Fasting glucose | 5.6 mmol/L or above, or type 2 diabetes already diagnosed | Venous blood test |
Two footnotes matter. The waist thresholds shift by ethnicity: for South Asian and Chinese men the figure is 90cm rather than 94cm. And if your BMI is over 30, the IDF says central obesity can simply be assumed and the tape measure skipped.
Notice what is missing. Insulin resistance is the engine behind most of this, yet it is not on the list. The IDF left it out because it is hard to measure in routine practice. Our insulin resistance guide covers the markers that get closer to it.
3. Which two can you check tonight for free?
Waist and blood pressure. Start there, because they cost nothing and they narrow the question fast.
- Waist. Measure at the midpoint between your lowest rib and the top of your hip bone, breathing out normally. Not at the trouser line.
- Blood pressure. Most UK pharmacies check it free. Sit still for five minutes first, and take the average of two readings.
Why waist rather than BMI? Because BMI cannot tell where the weight sits. Fat around the organs behaves differently from fat under the skin, and it is the abdominal kind that tracks with the other four markers. A tape measure catches that. A set of scales does not.
If your waist is under the threshold, the IDF definition does not apply to you, whatever the other four say. That is worth knowing before you spend anything.
4. Which of the five need a blood test?
Three of them. Two are straightforward and one is not, so here is the honest split.
Triglycerides and HDL are easy. Both sit on a standard lipid panel, and a home finger-prick sample handles them fine. Triglycerides are the fats circulating in your blood. HDL is the cholesterol carrier that clears excess back to the liver, which is why a low number counts against you here. They also read most accurately after an overnight fast, so book a morning appointment with yourself. Our cholesterol blood test guide explains the full lipid picture.
Fasting glucose is the awkward one. It needs a venous sample drawn at a clinic, not a finger-prick, so Helvy does not offer it. There is no way to dress that up.
HbA1c is the practical stand-in, though be clear about what it is. It reflects your average blood sugar over roughly three months, and it is not one of the five IDF criteria. It answers a neighbouring question rather than the same one. It also happens to be the marker the NHS uses to identify pre-diabetes, covered in our pre-diabetes guide.
5. What if you tick three of the five?
Then take it to a GP. A set of numbers is not a diagnosis, and this is exactly the point where a qualified clinician should look at the whole picture rather than a table.
The reassuring part is that these markers move. Triglycerides in particular respond quickly to changes in alcohol, refined carbs and weight. The NHS advice for this cluster is unglamorous and consistent: lose excess weight, eat more whole grains and vegetables, aim for 150 minutes of moderate activity a week, stop smoking, and sit less.
One caution on retesting. Give any change at least three months before you measure again. Lipids drift week to week, and a single reading taken too soon tells you more about last night's dinner than about your progress.
6. Which blood test should you take?
Helvy's Advanced Heart Health panel (£159) is the closest match. It measures triglycerides and HDL, the two lipid criteria, alongside HbA1c, ApoB, Lp(a) and hs-CRP.
If you want a broader first look, the General Energy & Wellness panel (£149) covers the full cholesterol panel plus thyroid, cortisol, vitamin D, B12, magnesium and core kidney markers. HbA1c sits in Advanced Heart Health rather than this one. Prefer to choose markers yourself? The build-my-test tool walks you through it.
Both use a home finger-prick sample processed by UKAS-accredited UK labs, with results usually within 5 working days of the lab receiving your sample. Every guide on blood sugar, weight and lipids sits in our metabolic health hub.
READY TO TEST?
Two of the five checks are one blood test away
Helvy's home blood tests measure triglycerides and HDL alongside the wider metabolic picture, with the context to read them. Results usually within 5 working days of the lab receiving your sample, from UKAS-accredited UK labs.
Frequently asked questions
How many criteria do you need for metabolic syndrome?
Three, but not any three. The IDF definition requires central obesity, measured by waist circumference, plus any two of raised triglycerides, low HDL cholesterol, raised blood pressure or raised fasting glucose.
Can a blood test diagnose metabolic syndrome?
No. A blood test measures three of the markers used in the definition and offers wellness insight. Waist and blood pressure are measured separately, and a qualified clinician interprets the whole set.
What are the symptoms of metabolic syndrome?
Usually none. The NHS states you may not have any symptoms, which is why it is generally picked up through measurement rather than through how you feel.
Do I need to fast before the blood test?
Ideally yes. Triglycerides read most accurately after a 9 to 12 hour overnight fast. If you eat first, the other markers stay reliable and your triglyceride figure is read as non-fasting.
Is metabolic syndrome the same as pre-diabetes?
No, though they overlap. Pre-diabetes is defined by blood sugar alone. Metabolic syndrome is a wider cluster that also takes in waist, lipids and blood pressure. You can have one without the other.
Related guides
Insulin Resistance Blood Test UK
The engine behind the cluster, and the markers that get closest to it.
Triglycerides Blood Test UK
Normal vs high in mmol/L, and the fastest ways to bring them down.
HDL Cholesterol UK
Why a low number counts against you, and what actually raises it.
Pre-Diabetes Blood Test UK
HbA1c thresholds, and how pre-diabetes differs from this cluster.
Metabolic Health Blood Test UK
The wider set of biomarkers behind how your metabolism is running.
Visceral Fat Blood Test UK
The same markers read from the other end: what they show when your weight looks fine.
Metabolic Health Hub
Every guide on blood sugar, weight, lipids and insulin.