Clorazepate Level

Tranxene, Gen-XENE, Novo-Clopate, Clorazepate Level (assayed as Nordiazepam)

Test Codes

EPIC: LAB1231304, Beaker: XCLZP, Warde: NORDZ

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tube.

Do not use Serum Separator Tubes.

Physician Office/Draw Specimen Preparation

Centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Preparation for Courier Transport

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46°F). (Minimum: 0.2 mL)

Rejection Criteria

• Gross hemolysis.
• Grossly lipemic.
• Grossly icteric.
• Serum Separator (SST) tubes.
• Specimens not collected and processed as indicated.

In-Lab Processing

Centrifuge to separate serum from cells. Transfer serum to a plastic transport tube and refrigerate (2-8°C or 36-46°F).

Transport: 1.0 mL serum, refrigerated (2-8°C or 36-46°F). (Minimum: 0.2 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 48 hours
Refrigerated (2-8°C or 36-46°F): 7 days
Frozen (-20°C/-4°F or below): 14 days

Specimen Storage in Department Prior to Disposal:

Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Laboratory

Sent to Warde Medical Laboratory, Ann Arbor, MI.

Performed

Monday – Friday.
Results available within 2-3 days.

Reference Range

Therapeutic: 100-1000 ng/mL

Toxic: >3000 ng/mL

Test Methodology

High Performance Liquid Chromatography

Interpretation

Clorazepate is assayed as Nordiazepam.

CPT Codes

80346, (alt G0480).

Contacts

Last Updated

2/6/2026