Test Details

Mnemonic

BENZP

Ordering Code

1750970

CPT-4 Code(s)

80346 (G0480)

Specimen Information

Collect

Red top
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Specimen Preparation

Centrifuge, separate serum from cells and send 1.0 mL serum refrigerated in a screw capped plastic vial.
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Minimum Volume

0.2 mL
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Transport Temperature

Refrigerated
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Rejection Criteria

SST
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Stability

Room temperature: 48 hours
Refrigerated: 14 days
Frozen: 14 days
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Methodology

High Performance Liquid Chromotography/Tandem Mass Spectrometry
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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
Nordiazepam: >5000 ng/mL
N-Desalkylflurazepam: 30 – 150 ng/mL
Oxazepam: 200 – 500 ng/mL
Lorazepam: >300 ng/mL
Alprazolam: >100 ng/mL
Clonazepam: >80 ng/mL
Temazepam: 50 – 1000 ng/mL
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Performing Laboratory

Warde Medical Laboratory
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