Browse Medical Laboratory Calculators
Gamma Glutamyl Transferase (GGT) Unit Converter
Gamma Glutamyl Transferase (GGT) is an enzyme found primarily in the liver, bile ducts, and kidney tubules. Its main physiological role is the metabolism of glutathione and the transfer of amino acids across cell membranes.
Clinically, GGT is a highly sensitive marker for liver and biliary tract disease, especially cholestasis (bile duct blockage). Importantly, GGT is the liver enzyme most susceptible to induction by alcohol and certain drugs (e.g., phenytoin). Thus, it is often used to screen for alcohol abuse or chronic liver injury. When GGT is elevated alongside Alkaline Phosphatase (ALP), it strongly suggests a biliary or cholestatic issue. Results are reported in units of activity (U/L or µkat/L).
SI Units
RecommendedMicrokatals and Nanokatals per liter.
Conventional Units
Clinical Context
Reference Range: Normal GGT activity is typically highly sex-dependent, ranging from 8 – 61 U/L in men and 5 – 36 U/L in women.
GGT is the most sensitive marker of hepatobiliary obstruction or excessive alcohol consumption. Levels exceeding 100 U/L warrant investigation. Unlike Alkaline Phosphatase (ALP), GGT is not elevated in bone disease, making it useful for confirming the hepatic source of an elevated ALP. The conversion factor is constant: 1 U/L ≈ 0.0167 µkat/L.
Clinical References
How to Use This Calculator
Follow these steps to get accurate clinical conversions instantly.
Enter Values
Input your laboratory results into the corresponding unit field (e.g., U/L). You can use either dot or comma decimals.
Automatic Conversion
The calculator works in real-time. As you type in one field, all other activity units (like µkat/L) are instantly updated.
Verify Units
Check the SI Units section. µkat/L is the standard ISO unit for enzyme activity.
Reset
Use the Clear button to reset all fields before starting a new calculation.
Frequently Asked Questions & Tips
Yes. U/L and IU/L (International Units per Liter) are interchangeable.
Chronic alcohol consumption induces the production of GGT in the liver, leading to elevated serum levels before other liver markers rise.