Medtox
Synonyms
GHB; γ-hydroxybutyrate
Expected Turnaround Time
5 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Information
In-house validated method
Specimen Requirements
Specimen
Serum or plasma
Volume
5 mL
Minimum Volume
1.2 mL
Container
Red-top (no additive) tube or green-top (heparin) tube. Gel-barrier tubes are not recommended.
Collection
Transfer separated serum or plasma to a plastic transport tube.
Storage Instructions
Submission/transport (<3 days): Room temperature. For storage beyond three days, specimen should be refrigerated or frozen.
Test Details
Use
Detect use of gamma-hydroxybutyric acid (GHB), a psychoactive drug
Methodology
Initial presumptive testing by chromatography/tandem mass spectrometry (LC/MS-MS) at a testing threshold of 10.0 μg/mL; presumptive positives confirmed by definitive chromatography/mass spectrometry (GC/MS) at a testing threshold of 10.0 μg/mL
Reference Interval
NEGATIVE