Triglycerides (TG) Test: Normal Levels & Risks

What Are Triglycerides?

Triglycerides are the most common type of fat (lipid) in your blood. When you eat, your body converts any extra calories it doesn't need right away into triglycerides, which are stored in fat cells to be used later for energy between meals. While some triglycerides are essential for normal body functions, persistently high levels can increase your risk of heart disease, stroke, and acute pancreatitis.

In my clinical practice, I often see patients who are surprised to learn that triglycerides can be just as important as cholesterol when it comes to cardiovascular health. The test is typically included in a standard lipid panel, and it's measured after a 9- to 12-hour fast for the most accurate result.

Why Is a Triglyceride Test Ordered?

Your doctor may recommend a triglyceride test as part of a routine health check or if you have risk factors such as obesity, diabetes, high blood pressure, or a family history of heart disease. The test helps evaluate your risk of developing atherosclerosis (hardening of the arteries) and pancreatitis. It is also used to monitor the effectiveness of lifestyle changes or medications aimed at lowering fat levels in your blood.

How Is the Test Performed?

A simple blood draw from a vein in your arm is all that's required. You'll usually be asked to fast for 9–12 hours beforehand, drinking only water. The sample is sent to a laboratory, and results are typically available within a day or two. The standard LOINC code for this test is 2571-8 (Triglyceride [Mass/volume] in Serum or Plasma).

Reference Ranges for Triglycerides

The following table shows typical reference ranges for fasting serum triglycerides. Note that optimal levels may vary slightly depending on the laboratory and specific guidelines used (e.g., American Heart Association, European Society of Cardiology). Values are given in both mg/dL and mmol/L (multiply mg/dL by 0.0113 to get mmol/L).

These ranges assume a fasting sample. Non-fasting triglycerides can be higher, and your doctor will interpret the results in the context of your overall health.

What Do High Triglycerides Mean?

Elevated triglycerides are often a marker for metabolic syndrome, a cluster of conditions that includes high blood pressure, high blood sugar, excess abdominal fat, and abnormal cholesterol. Even mildly elevated levels (150–199 mg/dL) can increase cardiovascular risk. When triglycerides rise above 500 mg/dL, the risk of acute pancreatitis becomes significant, which can be a life-threatening condition.

Common Causes of High Triglycerides

• Diet: High intake of refined carbohydrates (sugar, white bread, pasta), sugary beverages, and alcohol.
• Obesity and inactivity: Excess weight and lack of physical activity raise triglycerides.
• Medical conditions: Uncontrolled diabetes, hypothyroidism, kidney disease, liver disease.
• Medications: Some diuretics, beta-blockers, steroids, and antiretroviral drugs can raise levels.
• Genetics: Familial hypertriglyceridemia or other inherited lipid disorders.

Is High Triglycerides Dangerous?

Yes, but the danger depends on how high they are. Persistent elevation increases the risk of heart attack, stroke, and peripheral artery disease. For patients with very high levels (≥500 mg/dL), my primary concern is pancreatitis — severe inflammation of the pancreas that causes intense abdominal pain and can be fatal if not treated promptly. Moderate elevations (150–499 mg/dL) are still a strong risk factor for atherosclerosis and should be addressed with lifestyle changes and possibly medication.

How to Lower Triglycerides Naturally

In my clinic, I tell patients that even a 5–10% reduction in body weight can lower triglycerides significantly. Here are the most effective strategies:

• Limit added sugars and refined carbs: Swap soda, sweets, and white bread for whole fruits, vegetables, and whole grains.
• Increase omega-3 fatty acids: Eat fatty fish (salmon, mackerel, sardines) at least twice a week, or consider fish oil supplements with a doctor's approval.
• Avoid alcohol: Even small amounts can raise triglycerides in sensitive individuals.
• Exercise regularly: Aim for at least 150 minutes of moderate aerobic activity (brisk walking, cycling) per week.
• Manage diabetes: If you have type 2 diabetes, better blood sugar control often lowers triglycerides.

Triglycerides During Pregnancy

It is perfectly normal for triglyceride levels to rise during pregnancy, especially in the second and third trimesters. This happens because the placenta produces hormones that shift your metabolism to provide more energy for the growing baby. Levels typically return to pre-pregnancy values within a few weeks after delivery. However, very high triglycerides during pregnancy (e.g., >300 mg/dL) may be associated with gestational diabetes or preeclampsia, so your obstetrician will monitor this closely.

Low Triglycerides — Is That a Problem?

Although less common, very low triglycerides (typically below 50 mg/dL) can occur. This may be seen in people with malnutrition, hyperthyroidism, or malabsorption syndromes. Low levels are not usually harmful, but if they persist, it's worth investigating the underlying cause.

When to See a Doctor

If your triglyceride test shows elevated levels, schedule a follow-up appointment to discuss a plan. Symptoms like unexplained abdominal pain, nausea, or vomiting could indicate pancreatitis and require immediate medical attention, especially if you have a history of high triglycerides.