GHB is produced endogenously in the body and functions as a neurotransmitter. The distinction between exogenous and endogenous GHB can be made only on the basis of the concentration of the compound. Endogenous GHB is present in urine at concentrations less than 10 mg/L and in plasma at less than 4 mg/L.
Urine samples must be collected within 12 hours of ingestion.
GHB is rapidly eliminated from the body. GHB is stable in the urine sample.
Uncertainty of Measurement:
12% at a concentration of 215 mg/L
Test only performed during normal working hours.
Also see Drug Screen (for Clinical Management) and Drug Screen (for Evidential Purposes).
Drug Screen (clinical management)
Drug Screen (Evidential Purposes)
Emails to
chemicalpathologist@adhb.govt.nz
will receive priority attention from the on-call chemical pathologist.
If the query concerns a specific patient please include the NHI number in your email.
If email is not a suitable option, please contact the on-call chemical pathologist via
Lablink (Auckland City Hospital ext. 22000 or 09-3078995).
Individual chemical pathologists may be contacted but will not be available at all times.
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:
Sakunthala@adhb.govt.nz
ext. 23427