GGT
A liver enzyme that rises early with fatty liver, alcohol and metabolic stress - often before other liver tests change.
TypeBlood test
HowStandard blood draw.
How oftenWith liver tests when needed.
BeforeAvoid alcohol for 24–48 hours for a fair reading.
WhoPeople with raised ALT, alcohol use or metabolic risk.
An early liver warning light
GGT is a liver enzyme that rises with alcohol, fatty liver and metabolic stress - often before other liver tests change. It isn’t specific on its own, but it’s a useful nudge to look closer.
Alcohol
“Is drinking affecting my liver?”
GGT often rises with regular drinking and falls when you cut back.
Common cause
Fatty liver
“Is my metabolism involved?”
Rises with weight around the middle and insulin resistance.
Common cause
Next step
“How do I know for sure?”
A FibroScan or ultrasound shows liver fat and stiffness directly.
Confirm
Is it right for you?
Worth considering if…
- Your other liver enzymes are borderline.
- You want a read on how alcohol affects you.
- You have metabolic risk or fatty liver.
A better option if…
- You want to know about liver scarring - FibroScan shows that.
How it’s measured
Lab blood draw
Often added to a liver panel on request.
The full picture
What is it?
An enzyme found mainly in the liver and bile ducts.
What type of test is it?
A blood biomarker.
What does it measure?
GGT activity in your blood.
Why might someone consider it?
It’s sensitive to liver stress from alcohol, fatty liver and some medications.
Who is it most relevant for?
People with liver or metabolic risk.
How is it performed?
A routine blood draw.
How often might it be considered?
When checking liver health.
What can the result help you understand?
Whether your liver may be under strain.
What are its limitations?
It isn’t specific - many things raise it.
What should it be viewed with?
ALT, AST, alkaline phosphatase, alcohol intake and FibroScan.
Where to get it
Through your provider
The simplest route - often covered when there’s a clear reason.
Lab services
e.g. Quest Diagnostics, Labcorp.
Direct-to-consumer panels
e.g. Function Health, InsideTracker.
Names are examples only, not endorsements. Your provider can often order the same test - and help interpret it.
Connected to
Questions to ask your provider
- Why is my GGT raised?
- Should I have a FibroScan?
Ziva Health
One test is a snapshot. Ziva shows the whole story.
Ziva brings your lab results, wearables and daily readings together - and Isabella tells you what’s changing and what to ask your provider next.
Refer Ziva to my provider / care team
Is your provider not on Ziva yet? Send them a link in under a minute - once they join, they’ll see your GGT result alongside your other trends and get alerts directly.
Refer my providerAlready seeing your provider?
Bring your Ziva 30-day report to your next appointment - your GGT result and daily trends in one view, so the conversation starts with the full picture.
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Being listed doesn’t mean everyone needs this test. Educational only — not medical advice. Results should be interpreted with a qualified clinician. ← Back to Know What to Test