Triglycerides

Overview

Triglycerides measure circulating levels of this major dietary fat form, stored in adipose tissue and providing energy between meals through lipoprotein packaging. They comprise three fatty acids esterified to glycerol, transported primarily as very-low-density lipoprotein (VLDL) from liver. Elevated levels indicate metabolic syndrome, diabetes risk, or dietary excess, while low levels rarely cause clinical symptoms; clinically useful for cardiovascular risk assessment, guiding lifestyle intervention, and monitoring response to fibrate or statin therapy when combined with LDL-cholesterol and HDL-cholesterol measurements.

Clinical Use Cases

  • Cardiovascular risk stratification in lipid panels.
  • Diagnosing familial hypertriglyceridemia or chylomicronemia syndrome.
  • Monitoring diabetic dyslipidemia management.
  • Assessing pancreatitis risk in severe hypertriglyceridemia (>1000 mg/dL).
  • Guiding therapy in metabolic syndrome patients.

Specimen Types

  • Serum.
  • Plasma (EDTA or heparin).

Measurement Methods

  • Enzymatic colorimetric assay (glycerol kinase method).
  • Automated clinical chemistry analyzers.
  • Ultracentrifugation (research reference method).

Test Preparation and Influencing Factors

  • Fasting 8-12 hours mandatory for accurate classification.
  • Avoid alcohol, high-fat meals 24-72 hours prior.
  • Recent exercise, acute illness, or stress elevate levels.
  • Estrogen therapy, beta-blockers, thiazides increase triglycerides.
  • Non-fasting levels useful for initial screening per recent guidelines.

Synonyms

  • Triacylglycerol.
  • TG.

Further Reading

  • “Triglyceride Test” – MedlinePlus, NIH – 
  • Wikipedia