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Triglycerides in Serum (Fasting)

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

This test measures the amount of triglycerides, a type of fat, in your blood after you’ve fasted for 8–12 hours. High levels may increase your risk of heart disease or stroke.

Quick summary

["Triglycerides are a key indicator of heart health when measured after fasting."]

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

Key facts at a glance

LOINC
70269-6
Short code
Trigl Plr fld/Ser
Synonyms
Trigl Plr fld/Ser
Category
glucose
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
true
Population
adult
Sex
all
Age range
18–65 years
CPT
86430
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 Is This Test Done?

Your doctor may order this test to check for high cholesterol or fat levels, especially if you have risk factors like obesity, diabetes, or a family history of heart disease. It can also help monitor conditions like pancreatitis or metabolic disorders.

What to Expect Before the Test

You’ll need to fast for 8–12 hours before the test, meaning no food or drink (except water) after midnight. Avoid alcohol and strenuous activity for 24 hours before your appointment.

How the Test Works

A blood sample will be taken from a vein in your arm. The blood is processed to separate serum (the liquid part after clotting), and the triglycerides are measured using a lab method called enzymatic analysis.

What the Results Mean

Results are typically reported in milligrams per deciliter (mg/dL). While exact ranges vary by lab, very high levels (often above 500 mg/dL) may signal pancreatitis or other health concerns. 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

Fasting Triglycerides

Frequently asked questions

What Does a High Level Indicate?
Elevated triglycerides can raise your risk of atherosclerosis (plaque buildup in arteries), heart attack, or stroke. They may also indicate underlying conditions like diabetes, kidney disease, or genetic disorders.
What Does a Low Level Indicate?
Low triglycerides are generally considered healthy, but very low levels (rarely measured) could sometimes suggest metabolic issues or malabsorption problems. Your doctor will assess results with other health factors.
How Often Should I Get This Test?
Most adults get this test as part of a routine cholesterol screening every 4–5 years, or more often if you have risk factors. Your doctor may recommend more frequent checks if you have conditions like high cholesterol or diabetes.
  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