Specimen Collection

Sample stability:

• 7 days at 15-25 ^o C
• 7 days at 2-8 ^o C
• 1 year at -20 ^o C

4.5 mL PST Blood (Preferred)

0.5 mL Paediatric Micro-PST Blood (Preferred)

5 mL Heparin Blood

4 mL Plain Blood

3.5 mL SST Blood

0.5 mL Paediatric Microsample Blood

0.5 mL Paediatric Micro-heparin Blood
Reference Intervals

Units: U/L

Adult male	0 - 60
Adult female	0 - 50
child <6 months	0 - 150

Children over 6 months: as adults

Uncertainty of Measurement: 6%

Turnaround Time: Within 3 hours
Assay Method

Principle: Colorimetric

Reagents: Roche GGT-2 kit

Analyser: Cobas c702

Diagnostic Use and Interpretation

Increased in obstructive liver disease, including post-hepatic obstruction.

Also increased to a lesser extent with any liver disease, even if obstruction is not apparent (inflammation, space occupying lesion)

Drug reaction should be considered if this is an isolated abnormal liver-related test (see Hepatotoxic drug reactions )

Raised levels may also be seen with infectious mononucleosis, renal transplants, and hyperthyroidism.

Contact Information

The chemical pathology team can be reached via email: chemicalpathologist@adhb.govt.nz or via Lablink (09) 307 4949 ext 22000 or 09-3078995

Emails will receive priority attention from the on-call chemical pathologist. Include the patients NHI.

After-hours: contact Lablink (Auckland City Hospital ext. 22000 or 09-3078995) or hospital operator for on duty staff after hours .

• Dr Samarina Musaad (Clinical Lead) : SamarinaM@adhb.govt.nz ext. 22402
• Dr Cam Kyle : CampbellK@adhb.govt.nz ext 22052
• Dr Weldon Chiu : WeldonC@adhb.govt.nz ext. 23427
• Dr Campbell Heron : CHeron@adhb.govt.nz ext. 23427
• Dr Sakunthala Jayasinghe Saku.Jayasinghe@adhb.govt.nz
• Dr Owen Yi WenyiYi@adhb.govt.nz

Last updated at 11:42:03 16/01/2026