Clobazam Metabolite, Serum

Onfi, Frisium, Urbanyl

Test Codes

EPIC: LAB1232033, Beaker: Clozabam, Quest: 11409

Department

Send Outs

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tube. Do not use Serum Separator Tubes. 

Also Acceptable: One Lavender-top (EDTA).

Physician Office/Draw Specimen Preparation

Centrifuge to separate serum or plasma from cells within 2 hours of collection. Transfer serum or plasma to a plastic transport tube and maintain at room temperature (20-26°C or 68-78.8°F) prior to transport.

Preparation for Courier Transport

Transport: 1.0 mL serum or plasma, room temperature (20-26°C or 68-78.8°F). (Minimum: 0.3 mL)

Rejection Criteria

• Serum Separator (SST) tubes.
• Specimens not collected and processed as indicated.

In-Lab Processing

Centrifuge to separate serum or plasma from cells within 2 hours of collection. Transfer serum or plasma to a plastic transport tube and maintain at room temperature (20-26°C or 68-78.8°F) prior to transport.

Transport: 1.0 mL serum or plasma, at room temperature (20-26°C or 68-78.8°F). (Minimum: 0.3 mL)

Storage

Specimen Stability for Testing:

Room Temperature (20-26°C or 68-78.8°F): 14 days
Refrigerated (2-8°C or 36-46°F): 30 days
Frozen (-20°C/-4°F or below): 60 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 Quest Diagnostics, Wood Dale, IL.

Performed

Daily.
Results available in 4-6 days.

Reference Range

Clobazam	None detected	ng/mL
Desmethylclobazam	None detected	ng/mL

Test Methodology

High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC-MS/MS)

Interpretation

By report.

CPT Codes

80299

Contacts

Last Updated

3/5/2026