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Test ID FGHSU Gamma-Hydroxybutyric Acid (GHB), Urine

Method Name

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

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

Reporting Name

GHB Screen, UR

Specimen Type


Specimen Required

Collect 10 mL random urine without preservatives. Ship refrigerated in a plastic container.

Specimen Minimum Volume

1.2 mL

Specimen Stability Information

Specimen Type Temperature Time
Urine Refrigerated (preferred) 14 days
  Frozen  180 days
  Ambient  72 hours

Reference Values

Reference Range: Negative


Screening threshold: 5.0 ug/mL


Day(s) and Time(s) Performed

Monday through Sunday

Performing Laboratory

Medtox Laboratories, Inc.

CPT Code Information


LOINC Code Information

Test ID Test Order Name Order LOINC Value
FGHSU GHB Screen, UR 29868-7


Result ID Test Result Name Result LOINC Value
Z4226 GHB 29868-7

Testing Algorithm

If the GHB Screen, UR is non-negative, then the Gamma-Hydroxybutyric Acid, CF, UR (FGHAC) will be performed at an additional charge.

Reflex Tests

Test ID Reporting Name Available Separately Always Performed
FGHAC Gamma-Hydroxybutyric Acid, CF, UR No No