High triglycerides: what the value means in blood tests and how to read it together with cholesterol

Written by

Redazione Qura

Medically reviewed by

Dott.ssa Gabba · Internal medicine

What the triglyceride value measures

Triglycerides are the most represented type of fat in the body. A small part is produced by the liver, but the amount circulating in the blood depends mostly on what we eat: the body turns the calories it does not use immediately into triglycerides and stores them in adipose tissue as an energy reserve.

On the report, triglyceride levels almost always appear within the lipid profile, next to total cholesterol, HDL and LDL. They are measured in milligrams per deciliter (mg/dL) on a sample that should be taken while fasting, because after a meal the value can rise markedly and make the result hard to compare.

high triglycerides symptoms — High triglycerides are often silent: they are only discovered through a blood test.

Triglyceride reference values: a convention, not a disease threshold

For triglycerides the ranges are more standardized than for other tests: according to the Italian National Institute of Health a desirable value does not exceed 150 mg/dL. These remain risk indications, however, not a sharp boundary between healthy and ill: the meaning of a value depends on the other lipid parameters and on the person’s history.

The most-used ranges in adults are these:

Range	Value (mg/dL)	How it is read
Desirable	up to 150	Favourable reference value
Borderline (at the limit)	150 - 199	Zone of attention, to be framed within the lipid profile
High	200 - 499	Hypertriglyceridemia: cardiometabolic risk to assess with the doctor
Very high	500 or more	To be managed with the doctor; above 1000 the risk of pancreatitis increases

In children and teenagers up to 17 years old the references are lower, and between laboratories there can be small differences linked to the method. This is why the range that matters for you is the one printed on your report, not a generic value.

High triglycerides: which factors make them rise

Among the most frequent causes of high triglycerides are a habitual caloric excess, a high consumption of sugars and refined carbohydrates, alcohol, excess weight and a sedentary lifestyle. The liver converts both excess sugars and alcohol into triglycerides: this is why these two factors often weigh more than dietary fat itself.

A high value can, however, also depend on clinical conditions, not only on lifestyle: diabetes or uncontrolled blood sugar, hypothyroidism, kidney diseases, and more rarely familial genetic forms. Some drugs too (for example corticosteroids, thiazide diuretics, estrogens, some beta-blockers) can raise them. This is why the same number does not have a single explanation and must be framed by the doctor.

high triglycerides causes — Excess sugars and alcohol often weigh more than dietary fat itself.

Why triglycerides must be read together with HDL and LDL cholesterol

This is the most overlooked point. High triglycerides are rarely an isolated problem: the Italian National Institute of Health recalls that they are often accompanied by high LDL and low HDL, a profile typical of insulin resistance, metabolic syndrome and type 2 diabetes. It is this overall picture, not the single number, that defines cardiovascular risk.

This is why triglycerides are interpreted together with the rest of the lipid profile. Some clinicians also use the triglyceride/HDL ratio as an indicative marker of the metabolic profile: an additional piece of data that the doctor reads, not a threshold to calculate on your own to self-diagnose. The same applies to the comparison with blood sugar and glycated hemoglobin, often altered in parallel.

The trend over time also matters: a stable value tells a different story from one that rises test after test. A single moved triglyceride value, without the rest of the picture and without the trend, says little. If you want to understand how a report is read as a whole, start from the guide on how to read blood test results.

When a high value deserves further investigation

Not every value just above 150 mg/dL requires immediate intervention. It is worth discussing it with the doctor when the value is markedly high, when it is associated with high LDL or low HDL, when high blood sugar, high blood pressure or abdominal excess weight coexist, or when it worsens compared with previous checks.

Very high values (above 500 mg/dL, and especially above 1000) should be assessed without delay, because in addition to cardiovascular risk the risk of pancreatitis increases. In any case the choices (investigations, any therapy, guidance on diet and physical activity) are up to the doctor, who knows your history and the other tests.

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Frequently asked questions

Do high triglycerides cause symptoms?

Usually not. High triglycerides are a silent condition, discovered only through a blood test. Any symptoms appear only at very high values and generally concern a complication, such as pancreatitis, not the triglycerides themselves. This is why lipid profile screening is useful even in the absence of complaints.

What is the normal value of triglycerides?

In adults a desirable value does not exceed 150 mg/dL. Between 150 and 199 is borderline, between 200 and 499 are high values, above 500 are very high values. These are indicative ranges: the meaning depends on the other lipid parameters and should be confirmed on your report, where the laboratory’s range is stated.

Do you need to fast to measure triglycerides?

Yes, usually an 8-12 hour fast is needed, because after a meal triglycerides rise and the value becomes hard to compare. It is also advisable to avoid alcohol in the preceding 24 hours. Always follow the laboratory’s instructions: in some cases the doctor may request a non-fasting measurement for specific purposes.

Can I have high triglycerides with normal cholesterol?

Yes, it can happen: triglycerides and cholesterol are different fats and do not always move together. Often, however, a high triglyceride value is associated with low HDL and an unfavourable metabolic profile. It is precisely for this reason that the value is assessed within the entire lipid profile, not on its own.