Metabolic syndrome criteria: the five numbers, and how many you need to have it

Short answer

Metabolic syndrome is diagnosed when three of five measurements cross their cut points: waist circumference above a population-specific threshold, triglycerides ≥150 mg/dL, HDL cholesterol <40 mg/dL in men or <50 mg/dL in women, blood pressure ≥130/85 mm Hg, and fasting glucose ≥100 mg/dL. Taking medication for any of them counts as a positive finding (1).

If you have been handed a lab printout and told you "have metabolic syndrome" without anyone explaining which numbers were counted, you're not imagining the confusion — the thresholds genuinely come from four different published definitions, and the waist number alone has twelve official versions. This is not your fault and not a sign you weren't listening. About 1 in 3 US adults meets the criteria (5), and almost none of them could recite the cut points from memory.

Note: this article explains how the criteria are written and is not medical advice; only a clinician can interpret your numbers and decide what they mean for you. Call 911 for chest pain or pressure, sudden weakness or numbness on one side, trouble speaking, sudden vision loss, or trouble breathing. A blood pressure reading of 180/120 mm Hg or higher with any of those symptoms is a hypertensive emergency and needs 911; without symptoms, it still needs same-day medical advice. Very high blood sugar with heavy thirst, frequent urination, vomiting, fruity breath or confusion needs urgent care (6, 8).

The five criteria and the exact line each one crosses

One paragraph of background, because this page is about the numbers: metabolic syndrome is not a disease you catch but a label for a cluster of five measurable risk factors that tend to travel together and, in combination, raise the risk of heart disease, stroke and type 2 diabetes (5). If you want the cluster explained rather than counted, read what is metabolic syndrome; if you want to know what it feels like, read metabolic syndrome symptoms. Everything below is about where the lines fall.

Here is the 2009 harmonized table — the version most US clinicians and guidelines now use (1).

Four details in that table do most of the work, and they are the four most people miss.

"And/or" in the blood pressure row is not filler. A reading of 134/78 meets criterion 4 on the systolic number alone. So does 118/88 on the diastolic number alone. You do not need both halves to be high; one is enough (1).

The HDL line sits 10 mg/dL apart for men and women. A woman with an HDL of 46 mg/dL meets the criterion. A man with exactly the same 46 mg/dL does not. This is the only criterion in the set with a built-in sex difference in the lab value itself, and we come back to why below.

Treatment counts as the finding. This is the rule that surprises people most. If your triglycerides are a tidy 120 mg/dL because you take a fibrate, criterion 2 is still scored as present. If your blood pressure is 118/74 on lisinopril, criterion 4 is still present. The criteria are counting risk factors you have, not numbers you currently display (1). A person on three medications can therefore meet three of five while every printed value looks normal.

The glucose line is 100, not 126. In the harmonized definition, fasting glucose crosses at 100 mg/dL — the prediabetes boundary, not the diabetes one (1, 8). NHLBI's own consumer diagnosis page describes the glucose criterion using the 126 mg/dL diabetes threshold while listing 100–125 mg/dL as prediabetes in the same paragraph (6), which is one reason readers come away unsure. The research definition that prevalence figures are built on uses 100 (1, 9). Where a number between 100 and 125 sits in the wider picture is covered in prediabetes explained: numbers and range.

How many of the five do you need to have metabolic syndrome?

Three. Any three of the five, in any combination. The 2009 harmonized statement puts it in one sentence: "three abnormal findings out of 5 would qualify a person for the metabolic syndrome" (1). NHLBI says the same in plain words — "you may have metabolic syndrome if you have three or more of the following conditions" (5). ATP III, the 2001 definition that introduced the counting rule, also required three of five (2).

"Any three" means exactly that. There is no weighting, no points system and no required member of the trio. The authors of the harmonized statement were explicit that they "agreed that there should not be an obligatory component" (1). A person with a 31-inch waist, perfect glucose and three abnormal lipid-and-pressure findings meets the definition exactly as fully as a person whose only abnormal findings are waist, glucose and blood pressure.

That produces more routes in than most people expect. With five criteria and a threshold of three, there are ten different three-criterion combinations, five different four-criterion combinations and one way to have all five — sixteen distinct patterns, all of them equally "metabolic syndrome."

Two things follow from that table, and they matter more than the arithmetic.

Two of five is not a diagnosis, and it is also not nothing. The definition draws a bright line where biology has a gradient. Someone at two criteria with a third value one point below its cut point is, physiologically, nearly indistinguishable from someone at three. The label changes; the person does not. This is the single most common reason people feel the criteria are arbitrary, and the criticism is fair — the cut points were chosen as practical, roughly risk-aligned boundaries for clinical use, not as biological cliffs (1, 2).

Which three you have is not recorded in the label. "Metabolic syndrome" on a chart does not say whether your three were lipids-and-waist or pressure-and-glucose, and those are different situations with different follow-ups. If your record says you have it, it is worth asking which three were counted and what each value actually was. That is the single most useful question in the "what to ask" section further down.

How common is three of five? In NHANES 2011–2016, 34.7% of US adults aged 20 and over met the criteria: 19.5% of 20–39-year-olds, 39.4% of 40–59-year-olds and 48.6% of those 60 and over, with men at 35.1% and women at 34.3% (9). NHLBI rounds this to "about 1 in 3 adults" (5).

Why is the waist number different for different people?

Because the same waist measurement carries different amounts of metabolic risk in different populations, and because national bodies set their thresholds at different times from different data. Waist circumference is the only one of the five criteria whose cut point is not a single universal number — the harmonized table simply writes "population- and country-specific definitions" in the cell where the other four have figures (1).

Here are the recommended thresholds the 2009 statement published, converted to inches alongside centimeters.

What this means for a US reader. The 2009 statement recommends using IDF cut points for non-Europeans and either the IDF or the AHA/NHLBI cut points for people of European origin (1). In practice that is why a 37-inch waist can count as elevated in one clinic and not in another, and why NHLBI's page adds that "your provider may use different measurement values for diagnosis, depending on your race and ethnicity" (6). The thresholds are ancestry-based, not residence-based: the IDF asks that the cut points for a given ethnic group be used "wherever they are found," so a Japanese-American or South Asian-American is meant to be assessed against the Asian figures, not the US ones (4).

Why lower thresholds for some groups is not a double standard. People of South and East Asian ancestry tend to carry more visceral fat and show insulin resistance at smaller waists than people of European ancestry, so the same risk level arrives at a smaller tape reading (4). Lowering the cut point for those populations keeps the criterion pointing at the same amount of risk — it does not make the standard stricter in any meaningful sense.

Where the tape goes. NHLBI's instruction is simple: stand, run a tape around your middle just above your hipbones, and read it just after you breathe out, without pulling it tight (7). The harmonized statement does not mandate a single anatomical landmark, which is one more reason two clinics can get different numbers on the same person.

Why do ATP III, the IDF definition and the harmonized statement disagree?

Because they were written by different organizations in different years for different purposes, and each one revised the one before. Four documents matter. Reading them in order explains almost every discrepancy you will find online.

• NCEP ATP III — Year: 2001; Structure: Any 3 of 5, no required component; Waist cut point: >102 cm men, >88 cm women; Fasting glucose: ≥110 mg/dL

• AHA / NHLBI update (Grundy et al.) — Year: 2005; Structure: Any 3 of 5, structure unchanged; Waist cut point: Same as ATP III; Fasting glucose: Lowered to ≥100 mg/dL

• IDF consensus — Year: 2005–2006; Structure: Central obesity required, plus any 2 of the remaining 4; Waist cut point: Ethnicity-specific; ≥94 cm men, ≥80 cm women for Europids; Fasting glucose: ≥100 mg/dL

• Harmonized joint statement — Year: 2009; Structure: Any 3 of 5, no required component; Waist cut point: Population- and country-specific; Fasting glucose: ≥100 mg/dL

2001, ATP III. The National Cholesterol Education Program's Adult Treatment Panel III put the five-factor, three-of-five structure into general clinical use, with waist >102/>88 cm and fasting glucose at ≥110 mg/dL (2). Its panel also noted that some men develop the full metabolic picture at a waist of only 94–102 cm — the first hint that one universal waist number would not hold (2).

2005, the AHA/NHLBI update. Grundy and colleagues kept the three-of-five structure and lowered the fasting glucose threshold from 110 to 100 mg/dL to match the American Diabetes Association's revised impaired-fasting-glucose boundary (3). This is the single most consequential edit in the whole history: it moved a large group of people across the glucose line overnight, which is why older prevalence figures and newer ones are not directly comparable.

2005–2006, the IDF. The International Diabetes Federation took a different structural decision: it made central obesity a prerequisite, then required any two of the remaining four. Its table reads "central obesity ... plus any two of the following four factors," and it introduced the ethnicity-specific waist values, with a note that if BMI is above 30 kg/m², central obesity can be assumed without measuring (4). Under the IDF rules, a person with normal waist and four abnormal findings does not have metabolic syndrome. Under ATP III and the harmonized definition, they very much do.

2009, harmonization. Six organizations — the IDF, NHLBI, AHA, the World Heart Federation, the International Atherosclerosis Society and the International Association for the Study of Obesity — published a joint interim statement to end the split. They kept the IDF's population-specific waist thresholds and dropped the IDF's mandatory-waist rule, settling on any three of five (1). That hybrid is the current reference standard, published in Circulation on October 20, 2009.

So when two sources disagree about your numbers, the question to ask is which document they are quoting. Most of the live disagreements online are an ATP III page arguing with an IDF page across a fifteen-year-old gap that the harmonized statement already closed.

What is not one of the five criteria?

Plenty of numbers that feel like they belong. Knowing what is excluded is as useful as knowing what is included, because a worrying value outside the list does not add to your count of three.

• HbA1c (A1c) — Why people assume it is: It is the standard test for diabetes and prediabetes; What the definition actually uses: Only fasting plasma glucose is listed (1). A1c of 5.9% with fasting glucose of 96 does not score criterion 5

• LDL cholesterol — Why people assume it is: It is the cholesterol number people know best; What the definition actually uses: Only HDL and triglycerides are in the five. ATP III treated LDL as the primary target of therapy and the metabolic syndrome as a secondary target (2)

• Total cholesterol — Why people assume it is: Same reason; What the definition actually uses: Not in the set at all

• BMI — Why people assume it is: It is the standard obesity measure; What the definition actually uses: Waist circumference, not BMI. ATP III says abdominal obesity "is more highly correlated with the metabolic risk factors than is an elevated body mass index" (2). The IDF allows BMI >30 kg/m² as a stand-in for the waist measurement only (4)

• Fasting insulin or HOMA-IR — Why people assume it is: Insulin resistance is the mechanism underneath the syndrome; What the definition actually uses: Not a criterion. The IDF notes insulin resistance is "difficult to measure in day-to-day clinical practice" and deliberately left it out (4). How it is tested when it is tested: how is insulin resistance tested

• An oral glucose tolerance test — Why people assume it is: It is more sensitive than fasting glucose; What the definition actually uses: The IDF strongly recommends one above 100 mg/dL but says it "is not necessary to define presence of the syndrome" (4)

• Liver fat, uric acid, CRP, resting heart rate, HRV — Why people assume it is: All associate with the cluster; What the definition actually uses: None appear in any of the four definitions

Two consequences worth holding on to. First, a non-fasting lipid panel cannot score criteria 2 and 3 cleanly, and a non-fasting glucose cannot score criterion 5 at all — which is why the whole assessment is usually done on one fasting morning. Second, nothing a wearable records is on this list. Not one of the five. That is the honest starting point for the Welltory section below.

Getting the five numbers right: fasting, the cuff and the tape

The criteria assume measurements taken under specific conditions. Values collected casually can land you on the wrong side of a line in either direction.

Fasting means 8 to 12 hours without food. NHLBI describes the healthy fasting range as 70–99 mg/dL "after 8 to 12 hours of fasting (not eating)" (6). Black coffee is usually permitted; anything with calories is not. A glucose of 104 after a 6-hour fast is not a scored criterion 5, it is an uninterpretable number.

Triglycerides are the most food-sensitive value in the set. They rise for hours after a meal and after alcohol. A triglyceride level drawn non-fasting can read far above a fasting one in the same person on the same day, which is enough to flip criterion 2 on its own.

Blood pressure needs more than one reading. NHLBI's wording for the criterion is "consistently 130/85 mm Hg or higher" — consistently, not once (6). One elevated reading in a clinic, after a rushed walk from the parking lot, is a prompt to measure again rather than a scored criterion. What moves the number and what a single high reading does and does not mean is covered in what causes high blood pressure.

The tape is more error-prone than the lab. Clothing, where you hold the tape, whether you pull it tight and whether you breathe in all shift the reading by a couple of centimeters, and a couple of centimeters is sometimes the whole margin. Bare skin, just above the hipbones, tape snug but not compressing, read after breathing out (7).

The five are not usually taken on the same day in real life. A waist measurement at one visit, a lipid panel from three months ago and a blood pressure from the pharmacy are not a diagnosis; they are three unlinked observations. A diagnosis is a clinician putting a contemporaneous set together.

Living with metabolic syndrome criteria: the questions people ask next

I meet two criteria. Should I be relieved?

Relieved is the wrong frame; informed is the right one. Two of five is below the threshold and you do not carry the label — and the two findings you do have are still risk factors on their own, which is what they were before anyone grouped them. Two criteria is also the state most likely to become three, because the five tend to drift together. The practical move is knowing your five current values and the date they were taken, rather than knowing whether a word applies.

My numbers are normal because of my medication. Do I still "have" it?

By the criteria, yes. Drug treatment for raised triglycerides, low HDL, high blood pressure or high blood sugar is explicitly listed as an alternate indicator for each of those criteria (1). The definition is counting risk factors you have, not numbers you currently display. This is not a trick: the point is that a controlled risk factor is a treated risk factor, not an absent one.

Does one high reading at a screening event count?

For blood pressure, no — the criterion is written as a consistent level, not a single reading (6). For triglycerides and glucose, a non-fasting sample cannot be scored at all. A screening-event number is a reason to arrange a proper fasting panel, which is a genuinely useful outcome.

I am of Asian descent and my US clinic used the 40-inch line. Does that matter?

It can. The harmonized statement recommends IDF cut points for non-Europeans, which for Asian populations is ≥90 cm (about 35.5 in) for men and ≥80 cm (about 31.5 in) for women (1, 4). A man with a 37-inch waist scores criterion 1 under the Asian threshold and does not under the US one — a difference that can change the count from three to two. It is a reasonable thing to raise.

Nobody told me which three I met. Can I find out?

Yes, and you should. Ask for the actual values and dates of all five: waist in inches or centimeters, triglycerides, HDL, the blood pressure readings used, and fasting glucose. Any patient portal will have the lab values; the waist measurement and the blood pressure readings will be in the visit notes. Five numbers and five dates on one page is the whole picture.

Do the criteria work the same for everyone?

Not entirely. The five-criterion set as written applies to non-pregnant adults. Children and teenagers are assessed with different, age- and sex-specific cut-offs that a pediatric clinician sets (6). In pregnancy, the lipid and glucose values shift physiologically and the adult thresholds do not apply.

How to bring this up with your doctor

What to bring. A single sheet with five lines: waist measurement and date, triglycerides and date, HDL and date, two or three blood pressure readings with dates, fasting glucose and date, plus every medication you take for blood pressure, lipids or blood sugar. Most of this is already in your patient portal.

What to say. "I would like to know how many of the five metabolic syndrome criteria I currently meet, and which ones. Can we go through the numbers together?" That question is specific enough to be answerable in two minutes and hard to deflect.

What to ask for. A fasting lipid panel and fasting glucose if the most recent ones are over a year old. A waist measurement recorded in the chart, since it often is not. If your ancestry is South Asian, East Asian or Southeast Asian, ask which waist threshold is being applied to you and why (1). If your fasting glucose is between 100 and 125 mg/dL, ask whether an A1c is worth adding — it is not a criterion, but it is informative (8).

If you are at two criteria. Ask what would make it worth rechecking sooner than the standard interval, and what the plan is for the two findings you already have. "Below the threshold" is not the same as "no follow-up needed."

If you feel brushed off. The sentence that usually reopens the conversation is: "I understand I may not meet the full definition. I would still like the individual numbers recorded so we can see the trend next time." Asking for the numbers to be written down is a reasonable request that is hard to refuse.

If you have been told you have it and nothing else was said, ask explicitly what the next step is and when the five will be remeasured. Treatment and food are a separate conversation from the criteria — that ground is covered in the metabolic syndrome diet.

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How Welltory helps — and what it cannot do

The limits first, and on this topic they are unusually clean. Welltory is a general wellness product, not a medical device. It does not diagnose, detect, predict, monitor, prevent, treat or mitigate any condition, including metabolic syndrome. Metabolic syndrome is defined by five measurements, and Welltory measures none of the five: not your waist, not your blood pressure with a cuff, not your triglycerides, not your HDL, not your fasting glucose. Nothing in the app can raise or lower your count of three. Welltory's help center also notes that measurements may be inaccurate for people under 18 and during pregnancy (10).

We also cannot show you a chart of our own users' metabolic syndrome criteria, for the same reason: we hold no waist, cuff, lipid or fasting-glucose data to analyze. Any such chart would be invented, so there isn't one on this page.

What it can do is cover the gap between measurements. The five numbers are typically taken once a year at a physical. Between those two mornings there are 364 days with no data on this at all. What you can have, for those days, is a consistent record of your own: resting heart rate, heart rate variability, stress minutes, Battery and sleep, recorded the same way every day so that a change is a change in you rather than a change in method (12). That record is not a substitute for any criterion. It is context for the appointment where the criteria get measured.

Tags turn events into something you can look back at. Add a tag from the plus sign at the top of the feed — "fasting labs today," "started lisinopril," "waist 38 in," "no alcohol this week." When the Today screen marks a stress or rest stretch it asks "What happened?"; tap a suggested tag, type or speak, and correct the tags before saving. A dated tag on the day you started a medication is worth more six months later than any remembered impression.

Over months, My Patterns looks for what your tags have in common. My Patterns collects tags from stress and rest stretches on iOS with an Apple Watch or Oura, and patterns start appearing at around seven tagged events in a month. It finds associations in your own data — never causes, and never anything about the five criteria.

A record you can take to the appointment. The Journal (Premium) keeps your measurements, tags and notes, and from the web app you can export a CSV: Dashboard → choose a chart → Export (11). Walking in with "here are my last five fasting-lab dates and what changed in between" is a better use of fifteen minutes than reconstructing a year from memory. Anything your data shows is an association to discuss with a clinician, not a cause and not a diagnosis.

The same red flags apply here, in the same type size. Chest pain or pressure, sudden one-sided weakness or numbness, trouble speaking, sudden vision loss or trouble breathing means 911, whatever your app shows. A blood pressure reading of 180/120 mm Hg or higher with any of those symptoms is a hypertensive emergency; without symptoms it still needs same-day advice. Heavy thirst with frequent urination, vomiting, fruity breath or confusion needs urgent care (6, 8).

How we made it

Made with AI tools, then edited and fact-checked by the Welltory team. See our Editorial & AI policy.

Jane Smorodnikova, co-founder of Welltory, built the methodology behind how we read physiological data.

Written by Tatsiana Yashyna.

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