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Intel Lab Diagnostics Dubai
Single Biomarker

Gamma Glutamyl Transferase (GGT)

Liver & Bile Duct Enzyme

GGT is a liver enzyme that is particularly sensitive to alcohol use and bile duct obstruction. Elevated levels can help differentiate liver from bone causes of high ALP and assess alcohol-related liver damage.

BLOOD24 HOURSNO FASTING
AEDAED120
  • Free home collection
  • Physician-reviewed report

24 Hours

Turnaround

Blood

Sample

About This Test

What the Gamma Glutamyl Transferase (GGT) test tells you

Gamma glutamyl transferase is an enzyme anchored to the membranes of the cells lining the small bile ducts inside the liver, and it is also present in the pancreas, kidneys and intestine. Its job is to transfer glutamyl groups during the recycling of glutathione, one of the body's main antioxidant molecules. Only a small amount circulates in blood normally. The level rises when bile flow is impeded, when liver cells are irritated, or when the liver's enzyme systems are induced to work harder by alcohol or certain medicines.

In everyday practice GGT earns its place mainly as a discriminator. Alkaline phosphatase, another routinely measured enzyme, rises both in liver and bile duct disease and in bone conditions, growth and pregnancy. GGT is not present in bone, so measuring the two together resolves the ambiguity: a raised alkaline phosphatase accompanied by a raised GGT points towards the liver and bile ducts, while a raised alkaline phosphatase with an unremarkable GGT points away from them. This one comparison saves a great deal of unnecessary investigation.

GGT is extremely sensitive but not at all specific, and that combination is the source of most confusion about it. Alcohol raises it, but so do fatty liver disease, excess weight, insulin resistance, smoking, heart failure, several anticonvulsants and antibiotics, and many herbal preparations. An isolated raised GGT with an otherwise normal liver panel is a common finding and frequently does not indicate liver damage at all. It is best treated as a prompt to review alcohol intake, medicines and supplements, and metabolic health, sometimes with liver imaging, rather than as evidence of any particular cause.

Sample type
Blood
Turnaround
24 Hours
Fasting
Not required
Best for
Adults & teens
Why Get Tested?

Ordered to investigate the cause of elevated ALP, screen for alcohol-related liver disease, and evaluate bile duct problems.

  • Sorting out raised ALP

    GGT is absent from bone, so pairing the two tests shows whether a raised alkaline phosphatase comes from the liver and bile ducts or from elsewhere.

  • Detecting bile-flow problems

    It is one of the earliest and most sensitive markers of obstructed or sluggish bile flow, often rising before other liver tests move.

  • Assessing alcohol-related injury

    GGT responds to regular alcohol intake, which makes it useful for assessing liver effects and for following change over time.

  • Context for the liver panel

    Read with ALT, AST and bilirubin, it helps distinguish a cholestatic pattern from one dominated by liver cell injury.

When This Test Is Ordered

Reasons your doctor may request the Gamma Glutamyl Transferase (GGT) test

Your doctor may order this test for any of the reasons below. Some are routine checks, others follow specific symptoms or an earlier result.

  • Finding the source of a raised ALP

    • A raised alkaline phosphatase that needs its source identified.
    • Abnormal liver enzymes found on a routine panel.

  • Bile flow & alcohol

    • Symptoms suggesting obstructed bile flow, such as jaundice, itching, pale stools or dark urine.
    • Assessing and following liver effects of alcohol intake.

  • Fatty liver & medication

    • Follow-up of fatty liver disease or metabolic syndrome.
    • Monitoring medicines known to affect the liver or bile ducts.
Preparation
The short version
No prep needed.
  • Blood
  • Free home collection
  • No fasting
  • Results in 24 Hours
  1. 1
    Book any time

    No fasting window: pick any slot that suits you, online or on WhatsApp.

  2. 2
    We come to you

    A DHA-licensed nurse collects your sample at home or in the office: free home collection.

  3. 3
    Results in 24 Hours

    A physician-reviewed, easy-to-read report lands securely by WhatsApp and email.

Prep note
Physician reviewed

GGT itself does not require fasting, but it is usually taken as part of a liver panel that may be combined with a fasting lipid profile, so follow the instruction you are given when booking.

Avoid alcohol in the days before the test, since even a single episode of heavy drinking can raise the result, and be straightforward with your doctor about your usual intake so the value can be interpreted correctly rather than misread. Bring a full list of prescription medicines, over-the-counter painkillers, herbal remedies, slimming products and bodybuilding supplements, because many of these induce the enzyme.

Mention recent illness, gallbladder symptoms or any new medicine, and keep repeat tests at a similar time of day.

Reading a High or Low Result

  • What a higher result can point to

    • Obstruction or slowing of bile flow from gallstones, strictures, tumours or drug-induced cholestasis.
    • Regular or heavy alcohol intake, which induces the enzyme and can also injure liver cells.
    • Fatty liver disease, excess weight and insulin resistance.
    • Enzyme-inducing medicines such as some anticonvulsants and antibiotics, and many herbal and slimming preparations.
    • Hepatitis of any cause, cirrhosis, and tumours or secondary deposits in the liver.
    • Heart failure causing congestion of blood in the liver.

These are possibilities, not diagnoses. A single value outside the reference range is interpreted alongside your symptoms, history and other tests: your doctor decides what it means for you.

Limitations & Safety

What this test cannot tell you

  • GGT is very sensitive but highly non-specific: a raised value confirms that something is affecting the liver or bile ducts but never identifies which cause, and it is not proof of alcohol use.
  • It falls only gradually after alcohol is stopped or a medicine is withdrawn, so a raised value can persist for weeks after the trigger has gone.
  • A low or unremarkable GGT carries no established clinical significance, and the test is not used on its own to screen for liver disease.

Risks of the blood draw

  • Mild bruising or brief soreness where the needle went in.
  • Occasional lightheadedness, which settles after a few minutes of rest.
  • Bleeding or infection at the site, which is rare with sterile single-use equipment.
Key Points
  • 1GGT comes mainly from the cells lining the bile ducts inside the liver.
  • 2Its most useful role is telling you whether a raised alkaline phosphatase is of liver or bone origin.
  • 3It is sensitive to alcohol and to enzyme-inducing medicines, but a raised value alone does not establish the cause.
  • 4An isolated rise with an otherwise normal liver panel is common and often not a sign of liver damage.
  • 5Low values have no established clinical meaning, so only raised results are acted upon.
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FAQ

Frequently Asked Questions

Everything you need to know about the Gamma Glutamyl Transferase (GGT) test. Can't find what you're looking for?

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No. Alcohol is one common cause, but fatty liver, excess weight, insulin resistance, several prescribed medicines and herbal products raise it just as readily. The result is a reason to review all of these together, not a verdict about drinking.