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Lab Dept:
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Chemistry
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Test Name:
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GAMMA HYDROXYBUTYRIC ACID, URINE
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General Information
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Lab Order Codes:
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GHBA
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Synonyms:
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GHB
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CPT Codes:
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82491 – Chromatography, quantitative,column.
82542 (if positive) – Column chromatography/mass spectrometry quantitative,
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Test Includes:
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Gamma-Hydroxybutyric Acid level measured in ug/mL.
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Logistics
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Test Indications:
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Measurement of this sedative/hypnotic in urine.
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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MedTox Laboratories (Test # 1365)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-2206550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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5 days
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Special Instructions:
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N/A
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Specimen
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Specimen Type:
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Aliquot of random or spot urine collection
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Container:
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Screw-capped urine container without preservative
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Draw Volume:
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10 mL urine
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Processed Volume:
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Same as Draw Volume
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Collection:
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Random or spot urine collection
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Special Processing:
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Lab Staff: Aliquot urine into a screw-capped plastic vial without preservative. Store and ship at refrigerated temperatures. Ambient or frozen temperature is acceptable. Forward promptly.
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Patient Preparation:
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None
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Sample Rejection:
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Mislabeled specimens, unlabeled specimens
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Interpretive
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Reference Range:
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Negative
Positives will be confirmed and reported in ug/mL.
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Critical Values:
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N/A
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Limitations:
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Reporting limit: 5 ug/mL
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Methodology:
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Gas chromatography/Mass spectrometry (GC/MS). Gas Chromatography/Flame Ionization Detection (GC-FID).
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Contraindications:
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N/A
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References:
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MedTox Laboratories Web Page March 2009
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