| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Gamma-Glutamyltransferase (GGT), Plasma or Serum
Test CodeGGT - NOCO
CPT Codes
82977
Preferred Specimen
1 ml plasma from Green top (Lithium Heparin)
Minimum Volume
0.5 mL
Other Acceptable Specimens
1 mL serum from Serum Gel or Red Top
Specimen Stability
| Specimen Type | Temperature | Time |
| Plasma Li Hep | Refrigerated | 7 days |
| Serum SST | Refrigerated | 7 days |
| Red Top – Separated | Refrigerated | 7 days |
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis
Methodology
Setup Schedule
Monday through Sunday; Continuously
Report Available
Same day
Reference Range
Refer to the Chemistry Reference Range and Critical Results documents in the Resources file on the facility test directory page.
Clinical Significance
GGT is used in the diagnosis and monitoring of hepatobiliary diseases. Enzymatic activity of GGT is often the only parameter with increased values when testing for such diseases, and is one of the most sensitive indicators known. GGT is also a sensitive screening test for occult alcoholism. Elevated GGT activites are found in the serum of patients requiring long-term meidcation with phenobarbital and phenytoin. The GGT liquid reagent follows the formulation recommendation according to Szasz, but was optimized for performance and stability. The assay is optionally standardized against the original IFCC and Szasz methods.
Performing Laboratory
North Colorado Medical Center Laboratory
