Triglycerides Biomarker

Overview

Triglycerides are a type of lipid that measure the amount of fat circulating in the blood, reported in milligrams per deciliter (mg/dL). They are the main form of stored energy in the body and are transported in the bloodstream within lipoproteins. High triglyceride levels are associated with an increased risk of atherosclerosis, cardiovascular disease, and can be linked to pancreatitis when very high. Low triglyceride levels are uncommon but may occur with conditions such as malnutrition, hyperthyroidism, or malabsorption. Triglyceride testing is clinically useful for assessing cardiovascular risk, evaluating lipid metabolism disorders, and monitoring response to lifestyle or medication-based treatments.

Clinical Use Cases

Assess overall cardiovascular risk as part of a lipid profile or lipid panel.
Evaluate and monitor hypertriglyceridemia and mixed dyslipidemias.
Help identify secondary causes of lipid abnormalities, such as poorly controlled diabetes, hypothyroidism, liver disease, kidney disorders, and certain medications.
Monitor response to lifestyle modifications (diet, weight loss, physical activity) and lipid-lowering therapies.
Assess risk of pancreatitis in individuals with very high triglyceride levels (typically ≥500 mg/dL).

Specimen Types

Venous blood serum.
Venous blood plasma (often collected with heparin or other anticoagulants as part of a lipid panel).

Measurement Methods

Enzymatic colorimetric assays performed on automated clinical chemistry analyzers (standard method in clinical laboratories).
Triglyceride measurement as a component of a comprehensive lipid panel (total cholesterol, HDL, LDL, and triglycerides).

Test Preparation and Influencing Factors

Fasting for 8 to 12 hours prior to testing is commonly recommended; many guidelines suggest 9 to 12 hours or 10 to 12 hours for lipid panels.
Only water is usually allowed during the fasting period.
Nonfasting measurements may be acceptable in some settings for initial cardiovascular risk estimation, though fasting values remain standard in many practices.
Recent high-fat or high-carbohydrate meals can increase triglyceride levels and affect test results.
Alcohol intake can raise triglycerides and may influence measurements if consumed before testing. (This is widely noted in clinical guidance, though not explicitly detailed in the cited pages.)
Certain medications, including estrogens, corticosteroids, some diuretics, beta-blockers, and others, can raise triglyceride levels; clinicians may advise temporary adjustment before testing when appropriate.
Medical conditions such as poorly controlled diabetes, hypothyroidism, liver disease, kidney disease (e.g., nephrotic syndrome), and genetic lipid disorders can elevate triglycerides.
Conditions such as hyperthyroidism, malabsorption, malnutrition, or very low-fat diets can be associated with low triglyceride levels.
Timing of collection is often in the morning to facilitate overnight fasting and reduce variability.