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Test Code GHA Gamma-Hydroxybutyric Acid (GHB), Serum/Plasma

Important Note

Mayo test code FGHSP

Specimen Required

Submit only 1 of the following specimens:



Draw blood in a plain red-top tube(s), serum gel tube is not acceptable. Spin down and send 5 mL of serum refrigerated in a plastic vial.



Draw blood in a green-top (sodium heparin) tube(s), plasma gel tube is not acceptable. Spin down and send 5 mL of sodium heparin plasma refrigerated in a plastic vial.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
FGHA Gamma-Hydroxybutyric Acid, CF, SP No No

Testing Algorithm

If the GHB Screen S/P is non-negative, then the Gamma-Hydroxybutyric Acid, CF, SP (FGHA) will be performed at an additional charge.

Method Name

Liquid Chromatography with Tandem Mass Spectrometry (LC/MS/MS)

Gas Chromatography/Mass Spectrometry (GC/MS) (if appropriate)

Reporting Name

GHB Screen, S/P

Specimen Type


Specimen Minimum Volume

1.2 mL

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Refrigerated (preferred) 7 days
  Frozen  180 days
  Ambient  72 hours

Reject Due To

Hemolysis NA
Lipemia NA
Icterus NA
Other NA

Reference Values

Reference Range: Negative


Screening threshold: 5.0 ug/mL


Day(s) and Time(s) Performed

Monday through Sunday

Analytic Time

5 days

Performing Laboratory

Medtox Laboratories, Inc.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FGHSP GHB Screen, S/P 46085-7


Result ID Test Result Name Result LOINC Value
Z4223 GHB 46085-7

NY State Approved

Northwell Health Laboratories Additional Information:

Computer Interface Code

  PDM #  5910680