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Test Code GGT Gamma-Glutamyltransferase (GGT)

Important Note

Some antiepileptic drugs (phenytoin, barbiturates) and heavy alcohol consumption just prior to specimen collection may result in falsely elevated GGT values

Performing Laboratory

Memorial Hospital Laboratory- Automated Procedures  304-388-5953       
General Hospital Laboratory 304-388-6244
Teays Valley Hospital Laboratory 304-757-1770
Plateau Medical Center Laboratory 304-469-8621
Greenbrier Valley Laboratory 304-647-6060

Specimen Requirements

Plasma- Mint Green, Dark Green Lithium Heparin or Serum- SST gold top, red top

Allow SST or red top to completely clot

Spin and physically separate plasma/serum from contact with cells as soon as possible

4 mL of plasma/serum (minimum 2 mL)

Specimen Rejection

  • Improperly labeled, collected, stored, and transported
  • Quantity not sufficient
  • Hemolyzed 
  • Lipemic

Storage and Stability

Refrigerated 2-8oC 1 month
Frozen <-20oC 1 year

Reference Values

>19 yrs 9-64 U/L
1-19 yrs 6-41 U/L
< 1 yr  Not established at this time

Methodology

Photometric Assay Memorial, General, Teays, Plateau
Multi-Point Rate Greenbrier 

Days Test Set Up and Turnaround

Monday through Sunday, Continuously 

AM Collection Expected by 9AM same day
Routine Expected within 24 hrs
Stat Expected within 1 hr
Timed Expected results are test dependant

CPT Coding

82977