On your lab requisition: BioReference “GGTP (Gamma-GT)” (test code 0093-5)
The short answer
Sensitive marker for bile duct issues and alcohol-related liver damage, measured from a standard blood draw. At TestWell it costs $19.99 plus a $6 lab processing fee, needs no fasting, and results post in 1–3 business days. Physician-authorized with no doctor's visit or insurance needed; draw at Quest or Labcorp.
Hospital Lab
$80
cash pay
Other Labs
$25
+ lab fees
TestWell
$19.99
+ $6 lab processing fee
GGT is an enzyme found in the liver and bile ducts. It's one of the most sensitive markers for liver and bile duct problems. GGT is particularly useful for detecting alcohol-related liver damage and bile duct obstruction. It's often ordered alongside other liver enzymes to help differentiate between liver and bone sources of elevated alkaline phosphatase.
Gamma-Glutamyl Transferase — the most sensitive marker of biliary obstruction and the best single marker for alcohol-related liver injury. Often elevated when AST/ALT are still normal.
Anyone with elevated alkaline phosphatase (to confirm liver vs bone origin), suspected alcohol-related liver disease, monitoring statin or anti-seizure medications, evaluating bile duct obstruction.
Sample Type
Blood draw
Fasting
Not required
Results In
1–3 business days
Performed At
Quest or Labcorp
Your GGT (Gamma-Glutamyl Transferase) results will include values for each of the 1 biomarker tested, along with reference ranges. Results are reviewed by a licensed physician before being released to your secure portal.
If any values fall outside the normal range, your report will include guidance on what that may mean and recommended next steps. You'll receive an email notification when your results are ready, typically within 1–3 business days.
Typical reference range layout
Lab reports show where your value sits relative to established reference intervals—your physician interprets this in context for you. Already have results? Analyze them with your AI assistant against our physician-reviewed ranges.
Avoid alcohol for at least 24 hours. No fasting required.
What can throw off this result
Physician-reviewed “Before your test” pages — what each factor does, for how long, and what to do about it.
A GGT (Gamma-Glutamyl Transferase) test costs $19.99 at TestWell — $25.99 all-in when ordered alone, because the $6 lab processing fee is charged once per order, with no draw fee or physician fee added. Ordered directly from the labs' own consumer sites, the same test lists at $59.00 at Labcorp OnDemand (list prices checked Sep 12, 2026). Hospital outpatient labs typically bill around $80.00 self-pay for the same test, and often more. With insurance, what you pay depends on your deductible and your plan's negotiated rate; TestWell's price is fixed before the draw and is HSA/FSA-eligible. Full cost breakdown →
| Where you order | Price | One test, all-in | Notes |
|---|---|---|---|
| TestWell (drawn at Quest) | $19.99 | $25.99 | Includes the one $6 lab processing fee, charged once per order |
| TestWell (drawn at Labcorp) | $20.99 | $26.99 | Labcorp's own cost for this test is higher; same order, same portal, same physician review |
| TestWell (drawn at BioReference — New York & New Jersey) | $20.99 | $26.99 | New York and New Jersey orders route to BioReference; Quest Health and Labcorp OnDemand don't take self-ordered draws in those states |
| Labcorp OnDemand (Labcorp's own site) | $59.00 | $59.00 | list price checked Sep 12, 2026 |
| Hospital outpatient lab, self-pay (typical) | $80.00 | $80.00 | Reference figure; hospital charges vary widely by facility and are often higher |
56% less than the lower lab-direct list price, for the same draw at the same lab. Lab test codes: Quest test code 482 · Labcorp test no. 001958 · BioReference code 0093-5. Competitor prices are read from the linked public pages and re-checked regularly; the labs' sites may add taxes or change prices without notice.
Compare more: Quest Diagnostics price list · Labcorp price list · Quest vs Labcorp · Lab test price checker
Men: 8-61 U/L. Women: 5-36 U/L. GGT is highly inducible — elevated GGT with otherwise-normal liver enzymes is the classic 'silent' marker of heavy alcohol use (>4 drinks/day for weeks). Levels >2x upper limit warrant investigation for biliary or alcohol-related liver disease.
GGT catches biliary tract disease (gallstones, cholestasis, primary biliary cholangitis) and alcohol-related liver injury that ALT/AST can miss. It's also more sensitive than alkaline phosphatase for distinguishing liver vs bone origin of elevated alk phos.
Regular alcohol consumption — even moderate drinking (1-2 drinks/day for months) can elevate GGT. Other common causes: fatty liver, statins, anti-seizure drugs (phenytoin, carbamazepine), barbiturates, and biliary obstruction.
On TestWell, GGT is $19.99 — one of our cheapest labs. Quest Direct lists the same test at $25, walk-in hospital labs typically bill $60-80 without insurance.
No fasting required for GGT alone. But it's almost always ordered alongside other liver tests as part of a Liver Panel or CMP, so most people fast anyway.
Almost always yes. GGT alone is rarely diagnostic — pair it with ALT, AST, alkaline phosphatase, and bilirubin. The Liver Panel bundles all of these at a discount and gives a complete liver-injury picture.
Ordered directly, a GGT (Gamma-Glutamyl Transferase) test lists at $59.00 at Labcorp OnDemand (prices checked September 2026). TestWell orders the same test at the same Quest or Labcorp patient service centers for $19.99 — $25.99 all-in with the $6 per-order lab processing fee — paid out of pocket at checkout with no insurance, doctor's visit or draw fee; HSA and FSA cards are accepted.
GGT (Gamma-Glutamyl Transferase) test results are typically ready in 1–3 business days after your draw at Quest or Labcorp. TestWell emails you the moment they post, and your results dashboard shows each marker against its reference range with a plain-English explanation.
Alcohol can change a GGT (Gamma-Glutamyl Transferase) test result without anything being wrong. Alcohol can raise GGT — abstain before the draw; tell the interpreting clinician. Each factor is covered on our physician-reviewed "Before your test" pages; when one applies, the fix is usually to remove it and retest.
Order the GGT (Gamma-Glutamyl Transferase) test online from TestWell for $19.99 (plus a $6 per-order lab processing fee) — no doctor's visit, referral or insurance needed. A licensed physician authorizes the order, then you walk into any Quest or Labcorp patient service center near you for the draw (the lab locator on our site lists the closest ones by ZIP code), and results arrive in 1–3 business days.
The CPT code for a GGT (Gamma-Glutamyl Transferase) test is 82977. You can order it from TestWell for $19.99 — no doctor's visit or insurance required, with results in 1–3 business days.
The GGT (Gamma-Glutamyl Transferase) test is Quest Diagnostics test code 482, Labcorp test number 001958, BioReference code 0093-5 ("GGTP (Gamma-GT)") (CPT 82977). TestWell orders it under those codes for $19.99 at Quest, Labcorp or BioReference — no doctor's visit or insurance required, results in 1–3 business days. Codes verified against the labs' catalogs in 2026.
Medically reviewed by Youmna DiStefano, MD · Last reviewed September 2026
Related guide
Liver Function Tests Explained: What a Liver Panel Shows and When to Get One
TestWell Price
$19.99
+ $6 lab processing fee at checkout
No insurance needed · HIPAA compliant
Better value: the Liver Health Panel
Save $70.97This test is part of the Liver Health Panel — 4 tests · 13 biomarkers for $59.99, $70.97 less than à la carte.
$59.99$130.96
4 tests · 13 biomarkers
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GGT (Gamma-Glutamyl Transferase)
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