Test Overview
Method
Liquid chromatography-tandem mass spectrometry (LC-MS/MS)
Result Included
Diazepam; Nordiazepam; Combined Metabolite
Aliases/Synonyms
Benzodiazepines; Clorazepate; Valium; Tranxene; Nordiazepam
Specimen
Specimen Type
Gel-separator tubes are not acceptableSerum
Containers
Collection Containers
Red top (no additive)
Volume
Sample Volume
1 mL
Specimen Comment
Avoid gel-separator tubes.
Collection & Handling
Handling Information
Separate and aliquot within 2 hours. Store and send cold or frozen.
Stability
| Ambient | Refrigerated | Frozen |
|---|---|---|
| 14 days | 14 days | 14 days |
Rejection Criteria
| Criteria | Specification |
|---|---|
| Specimen | Gel tube |
Performance & Interpretation
Turnaround Time
12 days
Results
Name
Units
Reference Range
Conversion
-
Diazepamng/mLnmol/L x 0.285
-
Nordiazepamng/mLnmol/L x 0.266
-
Combined Metaboliteng/mLTherapeutic: 100 - 2500
Toxic: > 3000
Comment
Therapeutic ranges based on Consensus Guidelines for Therapeutic Drug Monitoring in Neuropsychopharmacology: Update 2017
Referral Location
Canada
Interface & Setup
HL7 Interface Codes
| Order Code | Result Name | Result Codes | Units |
|---|---|---|---|
| DIAZSM S | Diazepam | 64776 | ng/mL |
| Nordiazepam | 64777 | ng/mL | |
| Combined Metabolite | 64778 | ng/mL |
Test Version
Last Updated
2023-01-13