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Test Code LAB2337 Benzodiazepine Confirmation by Mass Spectrometry

Performing Laboratory

Barnes-Jewish Hospital Laboratory

Methodology

                                                   Drug         Cutoff (ng/mL)
Alprazolam Metabolite (Alpha hydroxyalprazolam) 20
Clonazepam Metabolite (7-Aminoclonazepam) 20
Flunitrazepam Metabolite (7-Aminoflunitrazepam) 20
Lorazepam  20
Midazolam Metabolite (1-Hydroxymidazolam) 100
Nordiazepam 20
Oxazepam 20
Temazepam 20

 

Testing Algorithm:

Results below cutoff are reported as Does Not Confirm. 

Results above cutoff are reported as Confirmed Positive.

For drug cutoff information refer to the individual drug analyte.

 

Confirmatory Method Name:

Liquid Chromatography Tandem Mass Spectrometry 

 

Literature Reference:

See individual test listings.

Specimen Requirements

Specimen Type: Urine, random

Container/Tube: Yellow-top urine collection tube or plain red-top tube (full)

Specimen Volume: 10 mL

Collection Instructions: No additive.

Additional Information: See Urine Collection in Special Instructions for additional information.

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: Screening result available 1 hour after receipt in laboratory. Confirmation performed within 48 hours, if applicable.
Routine: Screening result available 3 hours after receipt in laboratory. Confirmation performed within 48 hours, if applicable.

Test Classification and CPT Coding

80307-Drug screen

80346-Drug confirmation- Benzodiazepines (if appropriate) (G0480)

Reference Values

None detected

Specimen Transport Temperature

Ambient

Additional Information

For BJH Laboratory Use Only
Analyte Stability:

  • Specimens must be processed within 2 days.
  • Processed sample stability:
    • Ambient - 2 days
    • Refrigerated (2 - 8°C) - 7 days
    • Frozen (≤ -20°C) - 7 days
  • See Analyte Stability Chart under General Information for a complete list.

Laboratory Processing Instructions:

Test performed in BJH Core Lab.  Processed by automated line for delivery to the Cobas 8000 and the Waters LC-MS/MS for confirmation. Completed confirmations are stored frozen for 30 days. 

Special Instructions

LOINC Code Information

Name LOINC Code
Alpha hydroxyalprazolam 19326-8
7-Aminoclonazepam 58365-8
7-Aminoflunitrazepam 105950-0
Lorazepam 16205-7
1-Hydroxymidazolam 105947-6
Nordiazepam 16202-4
Oxazepam 19639-4
Temazepam 16206-5