Gamma-Glutamyl Transferase (GGT) Blood Test
Measures a liver and bile-duct-associated enzyme most often used to clarify whether an elevated alkaline phosphatase is more likely to come from the liver and bile ducts or from bone.
- No doctor visit or referral needed
- Members pay our cost on every test, never a markup
- Tracked over time alongside your other results
- HSA/FSA eligible
- Typical results in 1 day · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you · Find labs
Why people order the Gamma-Glutamyl Transferase (GGT) Blood Test
-
Jaundice, dark urine, pale stools, itching, or right-upper-abdominal discomfort
These symptoms can prompt a clinician-directed liver or bile-duct evaluation, but they are nonspecific and may require broader or urgent assessment.
-
Nausea, loss of appetite, fatigue, or other possible liver-related symptoms
GGT alone cannot determine whether the liver or bile ducts are causing these common symptoms.
-
Track a clinician-directed liver-health change
Repeat testing under comparable conditions can show a trend, but GGT cannot prove alcohol consumption or abstinence in an individual.
Who may consider the Gamma-Glutamyl Transferase (GGT) Blood Test
-
Metabolic liver risk, obesity, diabetes, viral hepatitis exposure, or substantial alcohol intake
These factors can affect GGT, but the test belongs within a broader liver evaluation rather than serving as a general wellness score.
-
Medicines or supplements that may affect the liver or the assay
Medication exposure can change GGT or complicate interpretation. Do not stop prescribed treatment solely for this test.
-
Clarify a raised alkaline phosphatase result
High GGT with high ALP supports a liver or bile-duct source, while normal GGT can make a non-hepatic source such as bone more likely. Neither pattern is conclusive by itself.
-
Follow abnormal liver-associated enzymes or a known liver or bile-duct condition
GGT is interpreted with ALT, AST, ALP, bilirubin, albumin, symptoms, history, medicines, and other ordered testing.
Is GGT the right test if my alkaline phosphatase is elevated?
It can be useful. An elevated GGT alongside elevated alkaline phosphatase can support a liver or biliary source, while GGT alone cannot identify the cause. Clinical context and other liver tests may still be needed.
Should I order GGT alone or a complete liver panel?
Choose standalone GGT for a focused follow-up question, especially when alkaline phosphatase source is being clarified. Choose a complete liver panel when a broader pattern across ALT, AST, alkaline phosphatase, bilirubin, and related markers is needed. GGT alone is not a complete assessment of liver function.
Is GGT appropriate as a general liver-health or alcohol-use screening test?
Not as a standalone screen. GGT is nonspecific and cannot diagnose fatty liver, prove alcohol use or abstinence, or identify a particular liver condition by itself. It is most useful when the result answers a defined liver or biliary question.
Do I need to fast or change alcohol, medicines, or supplements before testing?
Follow the selected order's instructions because fasting requirements differ. Record recent alcohol exposure, medicines, and supplements because they can affect GGT and its interpretation. Do not stop or change prescribed treatment solely for the test.
What members say on Trustpilot
What the Gamma-Glutamyl Transferase (GGT) Blood Test measures
Measures a liver and bile-duct-associated enzyme most often used to clarify whether an elevated alkaline phosphatase is more likely to come from the liver and bile ducts or from bone.
This is a standalone quantitative GGT activity test. Current matched US providers use LOINC 2324-2 and report U/L. Labcorp accepts serum or lithium-heparin plasma and uses a kinetic method. Quest uses serum and spectrophotometry. BioReference uses serum-based collection in its stored requirements.
GGT is found throughout the body but is concentrated in the liver. Blood GGT can increase with liver or bile-duct injury. Its most useful product-specific role is often to help interpret an elevated alkaline phosphatase, or ALP. When ALP and GGT are both elevated, a hepatobiliary source becomes more likely. When ALP is elevated but GGT is not, a bone source becomes more likely.
GGT is nonspecific. It cannot diagnose fatty liver, hepatitis, cirrhosis, bile-duct obstruction, alcohol use disorder, or any other condition by itself. This is not a complete liver panel and does not include ALT, AST, ALP, bilirubin, albumin, or other liver-related markers.
- Specimen
- Serum or plasma
- Measures
- Enzyme activity
- Reported biomarkers
- GGT
- Biomarker count
- 1 biomarker
- Fasting
- Special preparation needed (provider-specific fasting)
- Results
- On your Mito dashboard in 1 day, with your range explained
- Reference ranges
-
Quest Diagnostics Test 482 selected Labcorp Test 001958 selected
Quest Diagnostics Test 482
- Male, 16-19 years 9-31 U/L
- Female, 16-19 years 6-26 U/L
- Male, 20-29 years 3-70 U/L
- Female, 20-29 years 3-40 U/L
- Male, 30-39 years 3-90 U/L
- Female, 30-39 years 3-50 U/L
- Male, 40-54 years 3-95 U/L
- Female, 40-49 years 3-55 U/L
- Female, 50-59 years 3-70 U/L
- Male, 55-59 years 3-85 U/L
- Male, 60 years and older 3-70 U/L
- Female, 60 years and older 3-65 U/L
Labcorp Test 001958
- Male, Adult, no age split published 0-65 IU/L
- Female, Adult, no age split published 0-60 IU/L
Your results
How to understand your Gamma-Glutamyl Transferase (GGT) Blood Test result
GGT is an enzyme associated mainly with the liver and bile ducts. Its most useful role is often to help clarify where an elevated alkaline phosphatase result may be coming from. GGT is nonspecific, so it cannot identify a liver condition, alcohol exposure, or disease severity on its own. Providers may display enzyme activity as U/L or IU/L. Preserve the performing laboratory's unit and reporting context when comparing results.
GGT and ALP elevated
Makes a liver or bile-duct source more likely than a bone source. Supports that possibility but does not confirm the cause. Other liver tests, symptoms, and sometimes imaging are needed.
GGT elevated alone
Can occur with alcohol exposure, medicine effects, or liver and bile-duct conditions. Is best understood through the broader liver-test pattern and clinical context, not the GGT number alone.
GGT normal, ALP elevated
Makes a source outside the liver, such as bone, more likely. Still needs clinical context and does not identify a specific condition by itself.
How much the Gamma-Glutamyl Transferase (GGT) Blood Test costs
Compare exact Mito member and non-member prices with recently checked comparable offers. Collection and lab fees are shown separately.
| Lab | Test price | Collection or lab fee |
|---|---|---|
| Mito member | $3.00 | $15.00 Added once per order |
| Mito non-member | $4.20 | $15.00 Added once per order |
| Goodlabs | $6.00 | $12.00 $12 per visit, included in the final checkout total |
| Marek Diagnostics | $7.00 | $10.00 $10 added at checkout for an individual biomarker or custom panel |
| DrSays | $5.99 | $9.99 $9.99 collection fee per order |
| Jason Health | $5.00 | $18.00 $18 lab collection fee per order |
| Ulta Lab Tests | $23.95 | $12.95 $12.95 standard draw fee; some locations may charge more |
| Walk-In Lab | $29.00 | $6.00 $6 per-order physician fee |
Mito prices come from the live catalog for the selected provider. Competitor prices were checked August 22, 2026. Published standalone item price plus the separately disclosed collection or checkout fee.
See the full Gamma-Glutamyl Transferase (GGT) Blood Test cost comparison for provider details and comparison notes.
How it works
What to expect from your Gamma-Glutamyl Transferase (GGT) Blood Test
- 1 Book instantly
Click, book, done. Choose a convenient lab location near you. Transparent, up-front pricing.
- 2 Quick lab visit
Testing to fit your schedule, usually 15 minutes or less. Walk-in and appointments available. Follow the preparation instructions for your order.
- 3 Results in 1 day
Your result posts straight to your dashboard as soon as the lab completes it.
- 4 Expert guidance
With membership, a clinician reviews your result and a personalized action plan follows, with clear next steps.
Every result comes with a plan
A number on its own does not tell you much. Membership is what turns it into next steps, and keeps track of what changes.
-
Insights that connect the dots. A clinician reads your whole picture, not one result in isolation, connecting family history, past results, and lifestyle into clear next steps.
-
Your personalized action plan. Nutrition, supplements, and training in one clinician-reviewed protocol, updated as your results change.
-
Track your trends. Upload results from any lab and see each biomarker trend over time, so you know what is working.
-
Never miss a recheck. Mito tells you what is worth retesting and when, then reminds you so nothing slips.
Gamma-Glutamyl Transferase (GGT) Blood Test testing you can trust
Run to clinical-grade standards
- Processed at the same CLIA and CAP-accredited national labs your doctor uses
- Order online, no doctor visit or referral needed
- Your data is encrypted, handled under HIPAA, and never sold
Overseen by our Care Team Lead
Every result, including your Mito Brain analysis, is checked by Rhonda Collins, FNP-C, our Care Team Lead and a board-certified Family Nurse Practitioner with over 15 years of nursing experience across cardiac ICU, primary care, and dermatology.
Meet RhondaEverything your health needs,
in one membership
-
Every test at our cost
Members pay our cost on every test, with lab fees passed straight through. The full receipt is itemized, never padded.
-
Continuous tracking, all in one place
Upload past labs and watch your trends over time. Every marker and visit lives in one longitudinal record, so all your care stays together.
-
Year-round clinician support
Text anytime and get clinician-reviewed answers. When you want to go deeper, 1:1 consultations are available at affordable rates.
Common Gamma-Glutamyl Transferase (GGT) Blood Test questions
What does GGT measure?
Is GGT a liver-function test?
Why test GGT when alkaline phosphatase is high?
Can GGT diagnose fatty liver?
Can GGT prove alcohol use or abstinence?
Do I need to fast?
What if GGT is high?
What if jaundice or severe symptoms are present?
How do availability and prices vary by state?
Available in all 50 states and Washington, DC.
| States | Provider | Availability | Member price | Non-member price |
|---|---|---|---|---|
| All states and DC except NJ, NY, and RI | Labcorp | Available | $5.84 | $8.18 |
| All states and DC except NJ, NY, and RI | Quest Diagnostics | Available | $3.00 | $4.20 |
| NJ, NY, and RI | BioReference | Available | $5.49 | $7.69 |