Triglycerides: normal levels, causes of high results, how to lower
The triglycerides normal range for a fasting adult sample is under 150 mg/dL (1.7 mmol/L); results climb through borderline, high and very high categories from there. Triglycerides are a type of fat carried through the bloodstream mainly by VLDL particles, and a raised level is a routine finding on a lipid panel rather than a rare one.
This article covers what triglycerides are, why fasting and non-fasting results differ, the category table, common causes of a high result, the pancreatitis risk at very high values, and how triglycerides fit alongside non-HDL cholesterol when a clinician reviews a lipid panel. It does not re-explain LDL and HDL cholesterol on their own terms — for “good” and “bad” cholesterol, reference ranges and how to lower LDL, see our LDL and HDL cholesterol guide.
Triglycerides do not cause symptoms at ordinary levels, which is one reason they are measured as part of routine screening rather than in response to a complaint.
What triglycerides are and what carries them
Triglycerides are the body’s main stored form of fat. Extra calories that are not used immediately are converted into triglycerides and stored in fat cells; when the body needs energy, they are released back into the bloodstream. Because triglycerides do not dissolve in blood on their own, VLDL (very-low-density lipoprotein) particles carry them to tissues. A triglycerides test is usually ordered together with total cholesterol, LDL and HDL as part of a lipid panel, and the same blood draw can also feed into a broader heart-health blood test panel.
Triglyceride categories
| Category | Triglycerides |
|---|---|
| Desirable | Less than 150 mg/dL (below 1.7 mmol/L) |
| Borderline high | 150–199 mg/dL (1.7–2.25 mmol/L) |
| High | 200–499 mg/dL (2.26–5.64 mmol/L) |
| Very high | 500 mg/dL and above (5.65 mmol/L and above) |
mmol/L values are conversions of the mg/dL categories (÷ 88.5), rounded to two decimals at the boundaries.
These categories describe results from a fasting sample. A non-fasting result in the same range is not read against a separate scale in the sources cited here, but the value itself can be higher after eating, which is why the difference between fasting and non-fasting testing matters for how a single number is interpreted.
Triglycerides, remnant cholesterol and non-HDL cholesterol
When triglycerides are elevated, a clinician often looks at non-HDL cholesterol rather than LDL alone. Non-HDL cholesterol is calculated as total cholesterol minus HDL, so it captures LDL together with the other cholesterol-carrying particles that build up when triglycerides are high — including the triglyceride-rich VLDL particles and their remnants. Adults with ongoing elevations in non-HDL cholesterol carry a higher cardiovascular risk, which is one reason it is used as a supplementary marker when triglycerides are raised and a standard LDL calculation may be less reliable. This is a pattern a clinician interprets together with the rest of the lipid panel; it is not a separate diagnosis in its own right, and the underlying evidence linking these particles to cardiovascular disease is associative rather than a demonstration of direct cause in a given individual.
With that pattern in mind, the category numbers above also depend on how the sample was collected.
Fasting vs non-fasting testing
Triglycerides respond to food more than LDL or HDL do, so testing standards have traditionally called for fasting: no food for nine to 12 hours, water only, and no alcohol for at least 24 hours before the draw. A clinician can also decide to test without fasting, and the reference categories above are the fasting-based ones commonly reported by laboratories. If your result looks unexpectedly high, it is worth checking with the person who ordered the test whether the sample was meant to be fasting, and whether a repeat sample under standard preparation would be useful — the interval and whether to repeat at all depend on the result, your risk and your clinician’s plan, not on a fixed schedule.
What raises triglycerides
A high triglycerides result usually reflects more than one contributor at once. Recognised causes include:
- Diet — regularly eating more calories than are used, especially from added sugar and other refined carbohydrates, and a high intake of fat.
- Alcohol — alcohol use, including regular moderate intake, is a well-recognised driver of elevated triglycerides.
- Insulin resistance and poorly controlled diabetes — triglycerides frequently track with glucose control, and a raised result alongside an abnormal HbA1c or insulin/HOMA-IR result points toward a metabolic pattern rather than an isolated lipid problem.
- Thyroid disease — including hypothyroidism, which is why a TSH result is often reviewed alongside an unexplained lipid abnormality.
- Kidney and liver conditions — kidney disease and liver disease are both listed among recognised causes; markers such as those in a liver panel may be reviewed in the same visit.
- Medicines — thiazide diuretics, beta-blockers, estrogen-progestin contraceptives, antiretroviral (HIV) therapy and medicines used in breast cancer treatment are among those that can raise triglycerides.
- Genetic (inherited) forms — some people have an inherited tendency toward high triglycerides that runs in families, independent of diet or weight.
- Being overweight or having obesity, and smoking, are also recognised contributors.
Because so many of these overlap with each other and with other cardiovascular risk factors, a single triglycerides result is read as part of a wider clinical picture rather than in isolation. Working out which of these applies is a clinical judgment, not something a single test result can settle on its own.
Very high triglycerides and pancreatitis risk
Extremely high triglycerides carry a specific risk beyond the general cardiovascular one: acute pancreatitis. According to StatPearls (Hypertriglyceridemia), that risk increases once triglycerides pass roughly 500 mg/dL (5.6 mmol/L), and according to Testing.com, above roughly 1,000 mg/dL (11.3 mmol/L) there is a risk of pancreatitis in both children and adults, and treatment to lower triglycerides should begin as soon as possible. A result in this range is not something to manage on your own — it calls for prompt contact with the clinician who ordered the test or with the ordering healthcare service, rather than waiting for a routine follow-up appointment.
Lowering triglycerides
For most people, the first steps are lifestyle changes rather than medication:
- Alcohol — reducing or stopping alcohol intake, since triglycerides are particularly sensitive to it.
- Refined sugar and simple carbohydrates — cutting back on added sugar, sugary drinks and foods made mainly from white flour.
- Weight — working toward a healthier weight where relevant, alongside the other changes above.
- Physical activity — regular exercise is consistently linked to lower triglycerides.
When lifestyle changes are not enough, or when triglycerides are very high, a clinician may add medication. Prescription-strength omega-3 formulations exist for this purpose, but the decision to start one, which one, and at what dose belongs to a clinician who can weigh it against your overall cardiovascular risk, your other medicines and your lipid panel as a whole — this is not a self-directed choice, and it is not a recommendation to buy an over-the-counter supplement. The same applies to any other triglyceride-lowering medicine: starting, stopping or adjusting it is a decision made with the person who is treating you, not something to infer from a single result.
Tracking triglycerides with HealthLab
Triglycerides can move noticeably between one panel and the next depending on diet, alcohol and whether the sample was fasting, so a single result is easier to interpret next to previous ones than on its own. HealthLab imports lab reports from a PDF or a photo using AI recognition, and results can also be entered manually with an editable reference range and a free-text unit — manual entry is free and unlimited, while the free tier includes one AI import to try it and unlimited AI import is part of Pro. Each biomarker, including triglycerides, gets its own trend chart over time, results can be exported to PDF to bring to a doctor, and additional profiles for family members come with Pro. Health data from Apple Health and your lab results live in the app side by side, in separate views.
For the full list of what HealthLab tracks, see the lab results page. HealthLab organises your results and helps you prepare for the conversation with a doctor; it does not diagnose a condition or tell you whether a result needs treatment.
Frequently asked questions
What is a normal triglycerides level?
On a fasting sample, under 150 mg/dL (1.7 mmol/L) is generally described as desirable. Values from 150–199 mg/dL are borderline high, 200–499 mg/dL is high, and 500 mg/dL or above is very high. A non-fasting sample can read higher for reasons unrelated to your usual baseline, so check with whoever ordered the test whether the result was meant to be fasting.
Do I need to fast before a triglycerides test?
Current testing standards generally call for fasting nine to 12 hours, water only, with no alcohol for at least 24 hours beforehand, because triglycerides respond to food and alcohol more than LDL or HDL do. A clinician can also choose to test without fasting; follow whatever instructions you were given and tell the person drawing your blood whether or not you fasted.
Can high triglycerides be caused by something other than diet?
Yes. Alcohol use, insulin resistance or poorly controlled diabetes, hypothyroidism, some medicines, kidney or liver conditions, and inherited forms of high triglycerides are all recognised causes, often alongside diet rather than instead of it. Which of these applies in a given case is something a clinician works out from the full picture, not from the triglyceride number alone.
Why would a doctor look at non-HDL cholesterol instead of just LDL when triglycerides are high?
Non-HDL cholesterol (total cholesterol minus HDL) captures LDL together with the other triglyceride-carrying particles and their remnants, which can matter more when triglycerides are elevated. It is used as a supplementary marker in that situation rather than a replacement for the rest of the lipid panel.
How high do triglycerides have to be before it is an emergency?
According to StatPearls (Hypertriglyceridemia), the risk of acute pancreatitis increases above roughly 500 mg/dL (5.6 mmol/L), and per Testing.com, above roughly 1,000 mg/dL (11.3 mmol/L) there is a risk of pancreatitis in both children and adults, and treatment should start as soon as possible. A result that high should prompt urgent contact with your clinician rather than waiting for a routine follow-up.
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