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Epic Test Code LAB85 Gamma Glutamyl Transferase


GGT; g-glutamyl transferase

Specimen Type

Serum or Plasma

Preferred Container

Gold or Red top

Alternate Container

Green top

Volume Required

0.5 mL (Serum or Plasma)

Storage Requirements

Normal procedures for collecting and storing serum and plasma may be used for samples to be analyzed by this method. In the preparation of serum or plasma samples, avoid prolonged contact with the separated red cells. Sample tubes should be centrifuged within 2 hours of collection followed by transfer of the serum (red or gold top)) or plasma (green top) to a labeled plastic, aliquot tube.

Transportation Needs

Deliver specimen to the laboratory within 1 hour of collection.

Causes for Rejection

Mislabeled or unlabeled specimen

Hemolysis ≥ (1000 mg/dL HgB)

Lipemia ≥ (1500+-75 mg/dL Trig)

Bilirubin ≥ (60 mg/dL Bili)

Serum > 3 days refrigerated

Plasma > 24 hours room temperature


Days of Analysis


Available STAT



Siemens Dimension

Reference Values

Population Units Reference Range
Less than 1 week old U/L 8 - 260
> 1 week old U/L 8 - 78


CPT Code


Last Updated



LIS Code


Minimum Volume

0.1 mL (Serum or Plasma)