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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 found in your blood, after you’ve fasted for 8–12 hours. High levels may increase your risk of heart disease or other health concerns.

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
12228-3
Short code
Trigl Fld-mCnc
Synonyms
Trigl Fld-mCnc
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 Is Done

Your doctor may order this test to check for high triglyceride levels, which can be linked to conditions like high cholesterol, diabetes, or obesity. It may also be part of a routine cardiovascular risk assessment or to monitor treatment for conditions affecting fat metabolism.

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) for that period. Avoid alcohol and strenuous activity for 24 hours beforehand. Let your lab know if you’re pregnant, have diabetes, or take certain medications that could affect results.

What Happens During the Test

A healthcare provider will draw blood from a vein in your arm. The blood sample is sent to a lab for analysis using a specialized method to measure triglycerides precisely.

What the Results Mean

Results are typically reported as a numerical value (e.g., mg/dL). While reference ranges vary by lab, high levels (above typical thresholds) may signal increased cardiovascular risk. Your doctor will interpret results in the context of your overall health and medical history.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Fasting Triglycerides

Frequently asked questions

What are the normal reference ranges for this test?
Normal ranges can vary by lab and individual factors, so your doctor will provide personalized guidance. Generally, lower triglyceride levels are associated with better heart health, but results are interpreted alongside other health metrics.
Can I eat or drink anything before my test?
No, you must fast for 8–12 hours before the test, excluding water. Avoid alcohol and heavy meals to ensure accurate results.
Does this test require fasting, and what if I’m pregnant?
Yes, fasting is required. If you’re pregnant or have medical conditions, inform your doctor, as fasting guidelines may differ based on your health status.
  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