- 01Two risks at two heights
Below about 500 mg/dL, the triglyceride number is a proxy: apoB or non-HDL cholesterol measures the heart risk better. From 500 mg/dL, triglycerides become a treatment target in their own right, to keep them out of the range above about 1,000 mg/dL where they can trigger acute pancreatitis.
High triglycerides means a blood level of 150 mg/dL (1.7 mmol/L) or more. About 31% of US adults are at or above that line 4, the medical name is hypertriglyceridemia, and in most people the cause is metabolic and often modifiable: insulin resistance, belly fat, alcohol, added sugar or a recent meal. A high triglyceride reading carries two different risks at two different heights. Below about 500 mg/dL, it is a heart and metabolism signal, and the better gauge of heart risk is apoB (apolipoprotein B, a blood test that counts the particles that can clog arteries). From 500 mg/dL, guidelines treat triglycerides as a target in their own right, to keep them out of the range above about 1,000 mg/dL where they can trigger acute pancreatitis 12. For what triglycerides are and how they are measured, see the main triglycerides page.
High triglyceride levels: normal, borderline, high and very high
Where an example triglyceride result of 240 mg/dL fallsmg/dL
Lab reports use slightly different labels for high triglycerides. The table uses the US NCEP labels that most reports follow. To convert triglycerides from mmol/L to mg/dL, multiply by 88.57, so 1.7 mmol/L is about 150 mg/dL; the cholesterol unit converter does it for you, and lab units explained covers why labs differ.
| mg/dL | mmol/L | Label | What it means |
|---|---|---|---|
| Under 150 | Under 1.7 | Normal | No action on triglycerides alone |
| 150 to 199 | 1.7 to 2.2 | Borderline high | Often a meal, alcohol or early insulin resistance |
| 200 to 499 | 2.3 to 5.6 | High | Look for causes; check apoB or non-HDL |
| 500 to 999 | 5.7 to 11.2 | Very high | See a clinician soon; pancreatitis prevention becomes a goal |
| 1,000 to 1,999 | 11.3 to 22.5 | Very high (severe) | Call a clinician the same day or next day; emergency department now if belly pain |
| 2,000 or more | 22.6 or more | Very high (very severe) | Call a clinician the same day or next day; emergency department now if belly pain |
Some reports use the Endocrine Society grades instead: mild (150 to 199 mg/dL), moderate (200 to 999), severe (1,000 to 1,999) and very severe (2,000 or more) 2. The 2018 AHA/ACC cholesterol guideline adds one more line: triglycerides that stay at 175 mg/dL (2.0 mmol/L) or more count as a risk-enhancing factor, which can tip a borderline heart-risk estimate toward treatment 1. The Endocrine Society recommends that everyone with high triglycerides be checked for secondary causes, meaning another condition or a medicine that is pushing the number up 2.
Is 200 high? What specific readings mean
| Your triglycerides | Band | What usually comes next |
|---|---|---|
| 160 mg/dL (1.8 mmol/L) | Borderline high | Check whether you ate, drank alcohol or were ill before the draw. Compare with past results before reading much into one number. |
| 200 mg/dL (2.3 mmol/L) | High, at the bottom edge | Worth taking seriously if it repeats. Look at waist, glucose and HDL for an insulin-resistance pattern. |
| 250 mg/dL (2.8 mmol/L) | High | Look for causes (weight, alcohol, sugar, thyroid, kidneys, medicines) and read apoB or non-HDL for heart risk. |
| 600 mg/dL (6.8 mmol/L) | Very high | See a clinician soon. Alcohol matters most at this height, and a fasting repeat is usual. |
| 1,200 mg/dL (13.5 mmol/L) | Severe | Call your clinician the same day or next day, even without symptoms; emergency department now if you have belly pain. |
Did you fast? Why one reading can mislead
Fasting before a lipid panel is no longer standard. The European Atherosclerosis Society and the European Federation of Clinical Chemistry and Laboratory Medicine reviewed population data and found that after normal meals, triglycerides rise by only about 0.3 mmol/L (about 27 mg/dL) on average 3. The 2018 AHA/ACC guideline accepts non-fasting testing for most adults 1.
A normal meal rarely explains a big jump, but a few things can. Heavy drinking the night before, a very large fatty or sugary meal, or an acute illness can all push triglycerides well above a person's usual level. The AHA/ACC guideline advises repeating the test fasting when a non-fasting triglyceride result is 400 mg/dL or more 1. To compare a new result with an old one, match the conditions: same fasting state, no alcohol the day before, no recent illness. The guide on how to prepare for a blood test covers the details.
What causes high triglycerides
Two things raise triglycerides. The liver makes more very-low-density lipoprotein (VLDL, the particle that carries triglyceride out of the liver), or the body clears triglyceride-rich particles more slowly because lipoprotein lipase, the enzyme that unloads them into muscle and fat, works less well. Insulin resistance does both, which is why it sits at the top of the list.
Common causes
- Insulin resistance and extra fat around the waist, the single most common driver.
- Refined carbohydrates, added sugar and fructose, which the liver turns into triglyceride.
- Alcohol, which raises triglycerides in most people and sharply in some.
- Low physical activity.
- Prediabetes or type 2 diabetes, especially when glucose is poorly controlled; a fasting glucose shows whether blood sugar is part of the picture.
- Fatty liver, which travels with the same metabolic pattern; a raised ALT next to high triglycerides points that way.
Less common causes
- An underactive thyroid (hypothyroidism), which a TSH test rules in or out.
- Kidney disease, particularly nephrotic syndrome and chronic kidney disease.
- Pregnancy, when triglycerides normally rise, sometimes steeply in the third trimester.
- Medicines: oral estrogen, tamoxifen, corticosteroids, retinoids such as isotretinoin, thiazide diuretics, some beta-blockers, atypical antipsychotics and some HIV protease inhibitors 2.
Must-not-miss causes
Genetic forms matter most when triglycerides are very high. Familial combined hyperlipidemia often shows as high triglycerides and high LDL in several relatives. Familial chylomicronemia syndrome is rare and can push triglycerides above 1,000 mg/dL from childhood, with repeated pancreatitis. A secondary cause stacked on a genetic tendency (for example, uncontrolled diabetes plus heavy drinking in someone with a family pattern) is the usual route to severe levels 2. A new rise after starting a medicine is worth raising with the prescriber; do not stop a prescribed medicine on your own.
Symptoms of high triglycerides
Borderline, high and most very high triglyceride levels cause no symptoms. Tiredness, brain fog or weight gain are not recognised symptoms of triglycerides at these levels; when they appear alongside high triglycerides, a shared cause such as insulin resistance or an underactive thyroid is more likely. Symptoms show up only at severe levels, usually above 1,000 mg/dL 2:
- Acute pancreatitis: severe, steady pain in the upper belly, often spreading to the back, with nausea or vomiting.
- Eruptive xanthomas: crops of small yellow bumps, often on the buttocks, elbows or knees.
- Lipemia retinalis: retinal blood vessels that look creamy white on an eye exam.
- Milky or cloudy blood in the sample tube (lipemic serum), which the lab may note on the report.
High triglycerides cause up to about 10% of acute pancreatitis cases, and the risk climbs sharply above about 1,000 mg/dL 2. Severe upper belly pain with high triglycerides, especially in that range, needs an emergency department now.
Why high triglycerides matter: heart, pancreas, metabolism
The heart risk from high triglycerides comes from the particles that carry them. VLDL and its remnants each carry one apoB protein and a load of cholesterol (remnant cholesterol) that can lodge in artery walls. A genetic study by Ference and colleagues found that the heart benefit of lowering triglycerides tracked the fall in apoB; a triglyceride drop with little apoB drop gave little benefit 5. In practice, a person with triglycerides of 250 mg/dL and a high apoB carries more risk than a person with the same triglycerides and a normal apoB. As our apoB vs LDL comparison puts it, "When they disagree, usually with high triglycerides, insulin resistance, type 2 diabetes or a low LDL on treatment, most studies that look at that split find heart risk tracks ApoB more closely."
Therefore, the clinical benefit of lowering triglyceride and LDL-C levels may be proportional to the absolute change in ApoB.
The pancreas risk works differently. It depends on the triglyceride number itself and stays low until levels pass about 1,000 mg/dL, when large triglyceride-rich particles (chylomicrons) can clog the small vessels of the pancreas 2. That is why guidelines treat 500 or more as a reason to lower triglycerides directly, to prevent pancreatitis 1.
For metabolism, triglycerides of 150 mg/dL or more are one of the five criteria for metabolic syndrome. High triglycerides with low HDL cholesterol is the classic lipid pattern of insulin resistance.
Markers that change the reading
Read it with the rest of your lipid panel
A triglyceride result reads best next to the rest of the panel. Non-HDL cholesterol (total cholesterol minus HDL) captures the cholesterol in every harmful particle, including the triglyceride-rich ones. A calculated LDL cholesterol also needs care: the Friedewald formula many labs use becomes unreliable when triglycerides are high and is not valid above 400 mg/dL, so a direct LDL or apoB is better in that range 1. The guide on how to read your lipid panel walks through each line, and high cholesterol covers the LDL side.
CalculatorLDL calculatorTriglycerides high? Recalculate LDL with a newer equation that holds up better than Friedewald.Work it out How to lower triglycerides, and by how much
Triglycerides respond to lifestyle changes faster and further than LDL cholesterol does. The AHA scientific statement on triglycerides estimates that combined changes in diet, weight, exercise and alcohol can lower triglycerides by about 20 to 50% or more 4.
| Change | Rough effect on triglycerides | Notes |
|---|---|---|
| Lose 5 to 10% of body weight | About 20% lower 4 | The biggest single lever for most people |
| Mediterranean-style eating instead of low-fat | About 10 to 15% lower 4 | Swap refined starch for olive oil, nuts, legumes and fish |
| Cut or stop alcohol | Can fall sharply within weeks, most in heavy drinkers | Stopping completely matters most at 500 mg/dL or more |
| Cut added sugar, fructose and refined starch | Meaningful drop, larger in people who eat a lot of them | Sugary drinks are the easiest target |
| Regular aerobic exercise | Modest drop, larger alongside weight loss | Works best as a habit, not a burst |
| Eat oily fish | About 5 to 10% lower per gram of EPA and DHA a day 4 | Swap for processed or red meat |
Triglycerides respond within days to weeks, faster than LDL, so a recheck after 6 to 12 weeks usually shows the effect. Very high triglycerides (500 mg/dL or more) need a different plan, usually a very low-fat diet, no alcohol and medicine, set by a clinician. The heart topic and the heart health guide collect the related pages.
Supplements and medicines: what the trials show
Prescription omega-3 fatty acids lower triglycerides by roughly 20 to 30% in people with levels of 200 to 499 mg/dL, at doses of about 4 grams a day 6. Do not try to match that by taking many fish-oil capsules: high-dose omega-3 has been linked to a higher risk of atrial fibrillation and can add to bleeding risk with blood thinners, so dose is a decision for your clinician 78.
| Trial | What was tested | Triglyceride change | Heart events |
|---|---|---|---|
| REDUCE-IT (NEJM 2019) 7 | Icosapent ethyl (purified EPA) vs mineral oil, on statins, TG 135 to 499 | About 18% lower | 25% fewer major events |
| STRENGTH (JAMA 2020) 8 | EPA plus DHA vs corn oil | About 19% lower | No benefit; stopped early |
| PROMINENT (NEJM 2022) 9 | Pemafibrate (a fibrate) in type 2 diabetes | About 26% lower | No benefit |
The oil type and the placebo both seem to matter, and over-the-counter fish oil is not the product tested in REDUCE-IT. The comparison of fish oil vs algae oil covers the supplement forms.
Statins remain the first medicine for heart risk because they lower apoB. Fibrates lower triglycerides well, but neither PROMINENT nor ACCORD-Lipid (fenofibrate added to a statin) cut heart events overall 910, so fibrates are now used mainly to prevent pancreatitis at very high levels. Niacin also lowers triglycerides but added no benefit on top of a statin 11 and is rarely used now. Newer medicines target the rare familial chylomicronemia syndrome. Any of these is a decision to make with a clinician; do not start or stop a lipid medicine on your own.
Compounds with evidence for high triglycerides
When to retest and when to see a clinician
Clinicians usually recheck triglycerides 6 to 12 weeks after a change in diet, weight, alcohol or medicine, under the same conditions as the first test. One reading says less than a pattern, as the guide on why trends beat single readings explains.
- Triglycerides of 150 to 499 mg/dL and no apoB on your report: ask your clinician to add apoB at the next draw; non-HDL from your existing panel is a free stand-in meanwhile.
- Triglycerides that stay at 200 mg/dL or more: book a routine visit to look for causes and check heart risk.
- Any reading of 500 mg/dL or more: see a clinician promptly.
- Any reading of 1,000 mg/dL or more: contact your clinician the same day or next day; emergency department now if you have belly pain.
- High triglycerides with high glucose, a growing waist or a raised ALT: ask about insulin resistance, diabetes and fatty liver.
- A rise after starting a new medicine: tell the prescriber before changing anything.
Citations
- Grundy SM et al. 2018 AHA/ACC Guideline on the Management of Blood Cholesterol. Circulation. 2019;139:e1082-e1143.
- Berglund L et al. Evaluation and Treatment of Hypertriglyceridemia: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2012;97(9):2969-2989.
- Nordestgaard BG et al. Fasting is not routinely required for determination of a lipid profile: EAS/EFLM joint consensus statement. Eur Heart J. 2016;37(25):1944-1958.
- Miller M et al. Triglycerides and Cardiovascular Disease: A Scientific Statement From the American Heart Association. Circulation. 2011;123:2292-2333.
- Ference BA et al. Association of Triglyceride-Lowering LPL Variants and LDL-C-Lowering LDLR Variants With Risk of Coronary Heart Disease. JAMA. 2019;321(4):364-373.
- Skulas-Ray AC et al. Omega-3 Fatty Acids for the Management of Hypertriglyceridemia: A Science Advisory From the American Heart Association. Circulation. 2019;140:e673-e691.
- Bhatt DL et al. Cardiovascular Risk Reduction with Icosapent Ethyl for Hypertriglyceridemia (REDUCE-IT). N Engl J Med. 2019;380:11-22.
- Nicholls SJ et al. Effect of High-Dose Omega-3 Fatty Acids vs Corn Oil on Major Adverse Cardiovascular Events in Patients at High Cardiovascular Risk: The STRENGTH Randomized Clinical Trial. JAMA. 2020;324(22):2268-2280.
- Das Pradhan A et al. Triglyceride Lowering with Pemafibrate to Reduce Cardiovascular Risk (PROMINENT). N Engl J Med. 2022;387:1923-1934.
- ACCORD Study Group. Effects of Combination Lipid Therapy in Type 2 Diabetes Mellitus. N Engl J Med. 2010;362:1563-1574.
- AIM-HIGH Investigators. Niacin in Patients with Low HDL Cholesterol Levels Receiving Intensive Statin Therapy. N Engl J Med. 2011;365:2255-2267.
Educational context only, not medical advice or a diagnosis. Always discuss your results with a clinician.
