Skip to content

Gamma-Glutamyl Transferase (GGT) in Serum

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

This test measures the activity of an enzyme called gamma-glutamyl transferase, which helps break down certain amino acids. It’s often checked alongside other liver function tests.

Quick summary

["GGT helps assess liver health and detect potential liver damage or disease."]

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

Key facts at a glance

LOINC
109386-3
Short code
GABABR Ab Msmt Ser
Synonyms
GABABR Ab Msmt Ser
Category
coagulation
Sample
serum
Container
Red-top tube (SST)
Units
N/A
Fasting
false
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

What Is Gamma-Glutamyl Transferase (GGT) Used For?

GGT is primarily used to evaluate liver function and identify conditions like alcohol-related liver damage, bile duct blockages, or certain genetic disorders. It can also help monitor treatment progress in patients with chronic liver diseases.

How Is the Test Performed?

A blood sample is drawn from a vein in your arm. The blood is then processed to separate the serum, which is sent to a lab for testing using an immunoassay method to measure enzyme activity.

What Are Common Reasons for This Test?

Your healthcare provider may order a GGT test if you have symptoms like jaundice (yellowing skin/eyes), unexplained fatigue, or if you have a history of liver disease, alcohol use, or other conditions that could affect liver function.

How Do Results Relate to Liver Health?

Elevated GGT levels may indicate liver damage or stress, but they can also be influenced by factors like alcohol consumption, certain medications, or metabolic conditions. Elevated results alone don’t diagnose a specific condition but often prompt further testing.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

GGT Serum

Frequently asked questions

Why might my GGT test result be higher than expected?
Higher-than-normal GGT levels can result from liver diseases (such as hepatitis, cirrhosis), alcohol use, certain medications, or metabolic disorders. Your doctor will consider your overall health, symptoms, and other test results to determine the cause.
Can diet or lifestyle changes affect GGT levels?
Yes, factors like alcohol consumption, certain medications (e.g., antibiotics, antifungals), and metabolic conditions (e.g., obesity) can influence GGT levels. Reducing alcohol intake or adjusting medications may help normalize results.
What if my GGT test is normal but I still feel unwell?
Normal GGT levels don’t rule out liver issues entirely. If you have persistent symptoms (like fatigue, abdominal pain, or unexplained weight loss), your doctor may recommend additional tests, such as liver enzymes (ALT, AST), or imaging studies to investigate further.
  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