Test Details
Mnemonic
BENZP
Ordering Code
1750970
CPT-4 Code(s)
80346 (G0480)
Specimen Information
Collect
Red top
Specimen Preparation
Centrifuge, separate serum from cells and send 1.0 mL serum in a screw capped plastic vial.
Minimum Volume
0.5 mL
Transport Temperature
Refrigerated
Rejection Criteria
Serum separator tube (SST), grossly lipemic, hemolyzed, and icteric specimens.
Stability
Room temperature: 48 hours
Refrigerated: 14 days
Frozen: 14 days
Refrigerated: 14 days
Frozen: 14 days
Methodology
High Performance Liquid Chromotography/Tandem Mass Spectrometry
Reference Range
Therapeutic:
Chlordiazepoxide: 100 – 3000 ng/mL
Diazepam: 100 - 1000 ng/mL
Nordiazepam: 100 - 1000 ng/mL
N-Desalkylflurazepam: 30 – 150 ng/mL
Oxazepam: 200 – 500 ng/mL
Lorazepam: 50 – 240 ng/mL
Alprazolam: 7 – 40 ng/mL
Clonazepam: 15 – 60 ng/mL
Temazepam: 50 – 1000 ng/mL
Toxic:
sum of Diazepam + Nordiazepam: >5000 ng/mL
Nordiazepam: >3000 ng/mL
Diazepam: >3000 ng/mL
N-Desalkylflurazepam: >300 ng/mL
Oxazepam: NA
Lorazepam: >300 ng/mL
Alprazolam: >100 ng/mL
Clonazepam: >80 ng/mL
Temazepam: >3000 ng/mL
Chlordiazepoxide: 100 – 3000 ng/mL
Diazepam: 100 - 1000 ng/mL
Nordiazepam: 100 - 1000 ng/mL
N-Desalkylflurazepam: 30 – 150 ng/mL
Oxazepam: 200 – 500 ng/mL
Lorazepam: 50 – 240 ng/mL
Alprazolam: 7 – 40 ng/mL
Clonazepam: 15 – 60 ng/mL
Temazepam: 50 – 1000 ng/mL
Toxic:
sum of Diazepam + Nordiazepam: >5000 ng/mL
Nordiazepam: >3000 ng/mL
Diazepam: >3000 ng/mL
N-Desalkylflurazepam: >300 ng/mL
Oxazepam: NA
Lorazepam: >300 ng/mL
Alprazolam: >100 ng/mL
Clonazepam: >80 ng/mL
Temazepam: >3000 ng/mL
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
No