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Triglycerides / HDL Ratio

The triglyceride/HDL ratio divides your triglycerides by your HDL and gives a quick read on your insulin sensitivity.

What is Triglycerides / HDL Ratio?

The triglyceride/HDL ratio divides fasting triglycerides by HDL cholesterol to give a quick estimate of insulin sensitivity and metabolic risk. A high ratio closely tracks with the presence of small, dense LDL particles — more atherogenic than large ones — which form more readily with insulin resistance. The ratio is meaningful only as a fasting measurement: triglycerides spike sharply after a meal and normalise only hours later. Cut-offs differ between guidelines and countries depending on the units used. Treat the ratio as a signal, not a diagnosis.

Why is Triglycerides / HDL Ratio relevant?

The ratio is one of the few calculated markers that reflects both the lipid profile and metabolic regulation at once. A high ratio often appears years before fasting glucose or HbA1c fall outside the normal range. It is a useful early pointer for insulin resistance and an unfavourable metabolic pattern. Insulin resistance drives hepatic triglyceride production while simultaneously suppressing HDL production — pushing the ratio up from both ends. A high ratio is not a diagnosis, but a prompt to look at the broader metabolic picture.

Triglycerides / HDL Ratio high or low — what it means

Always read the ratio alongside fasting glucose, HbA1c, waist circumference, and ApoB. Test fasting: alcohol the evening before, a fatty meal, or even a short period of very low carbohydrate intake can substantially shift triglycerides. With an elevated ratio, look for signs of insulin resistance — abdominal fat, raised HbA1c, and high fasting glucose are the primary targets. Triglycerides tend to fall and HDL tends to rise as a by-product of better metabolic health.

Triglycerides / HDL Ratio reference ranges

Good (mmol/L)Triglycerides and HDL both in mmol/L (Dutch/SI units). This is the mmol/L counterpart of the < 2 mg/dL 'good' band (2.0 ÷ 2.3 ≈ 0.87); indicates good insulin sensitivity. Not a separate clinical cut-off but a unit conversion (source: Z-Center/Lamkin).< 0.87 ratio (mmol/L)
Insulin resistance (men)Optimal cut-point for insulin resistance in men (PLOS ONE, Giannini 2012, White European cohort; = 3.8 mg/dL)≥ 1.7 ratio (mmol/L)
Insulin resistance (women)Optimal cut-point for insulin resistance in women (PLOS ONE, Giannini 2012, White European cohort; = 2.0 mg/dL)≥ 0.9 ratio (mmol/L)
For reference (mg/dL)International/US units (Z-Center). ≥ 3.0 mg/dL is the rule-of-thumb for insulin resistance (McLaughlin, Stanford) — NOT comparable to mmol/L; multiply the mmol/L ratio by ~2.3 to compare.< 2 good · 2–4 moderate · > 4 high ratio (mg/dL)

Mind the units: in the Netherlands triglycerides and HDL are reported in mmol/L, so the cut-offs are far lower than the well-known US mg/dL threshold of 3.0 (conversion: ratio in mmol/L × ~2.3 ≈ ratio in mg/dL). Cut-offs also differ by sex, ethnicity, guideline, and lab. This is a calculated ratio with no official NHG standard; treat it as a signal, not a diagnosis. Always measure fasting.

Educational information only — not medical advice. Consult a healthcare professional for clinical decisions.

Read about our scientific approach →Read the guide: Heart health →

Frequently asked questions

What is a normal triglyceride/HDL ratio?

In Dutch/SI units (mmol/L, triglycerides divided by HDL) a ratio below roughly 0.87 is considered healthy and reflects good insulin sensitivity. Above about 1.7 in men and 0.9 in women the likelihood of insulin resistance rises (PLOS ONE). Mind the units: US studies use mg/dL, where a ratio of 3.0 or higher is the threshold — those numbers are not interchangeable with mmol/L (multiply your mmol/L ratio by about 2.3 to compare). Always measure fasting.

What does a high triglyceride/HDL ratio mean?

An elevated ratio (in mmol/L roughly above 1.7 in men or 0.9 in women) often points to insulin resistance and an unfavourable metabolic profile with small, dense LDL particles. Insulin resistance pushes triglycerides up and HDL down, worsening the ratio from both ends. It is not a diagnosis but a prompt to have fasting glucose, HbA1c, and waist circumference checked.

What does a low triglyceride/HDL ratio mean?

A low ratio (below about 0.87 in mmol/L) is favourable: it fits good insulin sensitivity, healthy triglycerides, and adequate HDL. The lower the better — there is no lower limit that signals a problem. A lifestyle with few fast sugars, regular exercise, and a healthy weight keeps the ratio low.

When is a triglyceride/HDL ratio concerning?

The ratio is an early signal, not a diagnosis. It becomes more relevant when it stays elevated (above roughly 1.7 in men or 0.9 in women in mmol/L) alongside other signs: raised HbA1c or fasting glucose, abdominal fat, or high ApoB. That may indicate (early) insulin resistance or metabolic syndrome — discuss it with your doctor. Always test fasting, because alcohol, a fatty meal, or a short low-carb period can shift triglycerides sharply; re-test under comparable conditions for an honest trend.

Related biomarkers

Triglycerides
Triglycerides are a blood fat that responds strongly to diet and alcohol and reflects your metabolic health.
HDL Cholesterol
HDL is the 'good' cholesterol that carries excess cholesterol back to your liver.
Glucose (Fasting)
Fasting glucose is your blood sugar after a night without eating and shows how well your body processes glucose.
Hemoglobin A1c
HbA1c shows what your average blood sugar has been over the past two to three months.

Triglycerides / HDL Ratio is one of the biomarkers in the Optimize blood test. Book a blood draw at any of 238+ partner labs in the Netherlands, or upload your existing results in the app.

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