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HelpTest Code GGT Gamma Glutamyltransferase (GGT) LAB85
Test Method
Enzymatic Rate Method; Beckman DXC600
Specimen Requirement
0.5 mL lithium heparin plasma or serum is required.
Additional Specimen Collection Information
Collect blood in a lithium heparin, green-top or red-top
tube.
PST and SST (gel tubes) are acceptable. Serum or plasma should
be
separated from contact with the cells within 2 hours of
collection.
Specimens not centrifuged within 4 hours of collection may be
rejected. Refrigerate the specimen if unable to assay within 8
hours of collection. Hemolyzed specimens are not acceptable.
Samples with >3+ lipemia must be cleared prior to analysis.
If
sample is stored longer than 48 hours, freeze at -15 to -20 C.
Frozen samples should be thawed only once.
Reference Values
7-63 IU/L
Performance
Testing is performed Monday through Sunday.
Routine orders: Typically completed within 4 hours
Expedite orders: Typically completed within 1 hour after the
specimen arrives at the testing site.
STAT orders: Typically completed within 30 minutes
after
the specimen arrives at the testing site.
Useful For
Diagnosis and monitoring of hepatobiliary disease, it is
currently the most sensitive enzymatic indicator of liver
disease
To ascertain whether observed elevations of alkaline
phosphatase
are due to skeletal disease (normal GGT) or reflect the presence
of
hepatobiliary disease (elevated GGT)
A screening test for occult alcoholism
LOINC Code Information
2324-2 Gamma Glutamyl Transferase [Enzymatic Activity/Volume]
In
Serum Or Plasma
CPT Code Information
82977 Chemistry: Glutamylransferase, gamma
(GGT)