Sign in →

Order Code MISMT - see under Specimen Required for more ordering info. Gamma-Hydroxybutyric Acid (GHB), Serum or Urine

Specimen Requirements

Fill out Medtox Requisition Toxicology and Therapeutic Drug Monitoring form; account number is 1669 (this should already be on the form).


Call MedTox courier at 651-628-6166 for specimen pick-up.


Collect 1 of the following specimens as close to suspected ingestion as possible:


Serum (MedTox test code#365)
Draw blood in a plain, red-top tube or dark green-top (heparin) tube. Spin down and send 5 mL of serum or heparinized plasma.


Urine (MedTox test code #1365)
10 mL from a random urine collection in a clean, plastic urine container with no preservative.

Reference Values


Performing Laboratory

MEDTOX Laboratories, Inc.

Day(s) Test Set Up

Monday through Sunday

Per MedTox, this test is available STAT for additional fee of $150 per test, but testing still may not be performed until next day.


Screen: Gas Chromatography/Flame Ionization Detection (GC-FID)

Confirmation: Gas Chromatography/Mass Spectrometry (GC/MS)

Test Classification and CPT Coding


82542-If positive

Specimen Transport Temperature

Ambient temperature is acceptable for shipping and/or short-term storage (up to 3 days); specimen may also be refrigerated or frozen