Gas Chromatography/Mass Spectrometry (GC/MS)
Suggested CPT Code(s)
New York State Approval Status


Turnaround Time

4-8 days (If Positive: 6-12 days)

Test Includes
1 Gamma-Hydroxybutyric Acid Gamma-Hydroxybutyrate; GHB Gas Chromatography/Mass Spectrometry (GC/MS) mcg/mL 5 Hypnotic, Sedative

Test Also Known As
Sodium Oxybate; Xyrem
Reflex Tests
Test Code Test Name
5101U Gamma-Hydroxybutyric Acid Confirmation, Urine
Compliance Statement
This test was developed and its performance characteristics determined by NMS Labs. It has not been cleared or approved by the US Food and Drug Administration.
Sample Type
Requested Volume
5 mL
Minimum Volume
2.8 mL
Special Handling
Sample Container
Plastic container (preservative-free)

Additional Collection Instructions

Transport Temperature
Light Protection
Not Required
Rejection Criteria

Rejection criteria pertain to clinical sample submissions only.

Room Temperature: 7 day(s)
Refrigerated: 7 day(s)
Frozen (-20 °C): 21 day(s)

The CPT Codes provided in this document are based on AMA Guidelines and are for informational purposes only. NMS Labs Does not assume responsibility for billing errors due to Reliance on the CPT Codes listed in this document.

*The information contained in this document represents database configurations, as they will appear on the effective date listed above.