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Triglycerides in Serum or Plasma (Fasting)

Published: August 9, 2026Updated: August 16, 2026

This test measures the amount of triglycerides, a type of fat found in your blood. Triglycerides are a key part of your overall lipid profile and play a role in heart health.

Quick summary

["Triglycerides help assess your risk for heart disease and other health conditions."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
35361-5
Short code
Lpa Trigl SerPl Ql
Synonyms
Lpa Trigl SerPl Ql
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
5 mL
Stability
Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
500
Lipemia max
1000
Icterus max
500
TAT
4–24 hours
Order
routine

Why This Test Matters

Your doctor may order this test to check your lipid levels, especially if you have a history of high cholesterol, obesity, diabetes, or a family history of heart disease. It can also help monitor conditions like metabolic syndrome or after treatments for high triglycerides.

What to Expect Before the Test

For a fasting triglyceride test, you’ll need to avoid eating or drinking (except water) for at least 8–12 hours before the blood draw. Non-fasting tests may still provide useful information but aren’t as precise.

How the Test Works

A small sample of your blood (either serum or plasma) is collected via a vein in your arm. The lab then uses a specialized method—often enzymatic—to measure the triglycerides present in your blood.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL). High levels may indicate an increased risk of heart disease or other health concerns, while lower levels may suggest better cardiovascular health. Your doctor will interpret results in the context of your overall health.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

Clinical Significance

Short name

Triglycerides

Frequently asked questions

What Does a High Triglyceride Level Indicate?
Elevated triglycerides can contribute to plaque buildup in your arteries, increasing the risk of heart attack or stroke. They may also signal underlying conditions like diabetes, kidney disease, or thyroid disorders. Your doctor may recommend lifestyle changes, medications, or further testing if levels are too high.
What Does a Low Triglyceride Level Indicate?
Triglycerides are rarely dangerously low unless caused by medications (e.g., beta-blockers) or rare genetic conditions. Generally, lower levels are associated with a reduced risk of heart disease, but they’re not the only factor in your lipid profile.
How Often Should I Get This Test?
Most adults with no risk factors may get a triglyceride test every 4–6 years. If you have risk factors (e.g., high cholesterol, diabetes, or a family history), your doctor may recommend more frequent testing, especially if you’re taking medications to lower triglycerides.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy