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Test Code CLOBZ Clobazam and Metabolite, Serum

Additional Codes

Epic Ordering Code LAB3041947
NBS code LBC11807
Service code 37139

Reporting Name

Clobazam and metabolite, S

Specimen Type

Serum Red


Specimen Required


Supplies: Sarstedt Aliquot Tube, 5 mL (T914)

Collection Container/Tube: Red top (serum gel/SST are not acceptable)

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Collect blood immediately before next scheduled dose.

2. Within 2 hours of collection centrifuge and aliquot serum into a plastic vial.

Additional Information: Trough specimens are recommended as therapeutic ranges are based on specimens collected at trough (ie, immediately before the next dose).


National University Hospital-Singapore Note:

NUH Outreach Laboratories:
Specimen Requirements
Submit the following:
Container: Red Top
Processing Requirements
Centrifuge and aliquot serum into a plastic vial within 2 hours
Specimen type: Serum
Volume: 0.5 mL
Storage/transport requirements: Refrigerated

Forms

If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-Therapeutics Test Request (T831)

-Neurology Specialty Testing Client Test Request (T732)

Specimen Minimum Volume

0.35 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Red Refrigerated (preferred) 28 days
  Ambient  28 days
  Frozen  28 days

Reject Due To

Gross hemolysis OK
Gross lipemia OK
Gross icterus OK

Method Name

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

Day(s) Performed

Monday through Friday

Report Available

Same day/1 to 5 days
National University Hospital-Singapore Note:

Please note that this is a referral test requiring transport to the external testing facility and an additional 3-5 days is required.

Reference Values

Clobazam

Therapeutic Range: 30-300 ng/mL

 

N-desmethylclobazam (Norclobazam)

Therapeutic Range: 300-3000 ng/mL

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Useful For

Monitoring clobazam therapy

CPT Code Information

G0480

80339 (if appropriate for select payers)

Clinical Toxicology CPT Code Client Guidance

LOINC Code Information

Test ID Test Order Name Order LOINC Value
CLOBZ Clobazam and metabolite, S 79408-1

 

Result ID Test Result Name Result LOINC Value
65483 Clobazam 3487-6
92363 N-desmethylclobazam 35107-2

Secondary ID

65483

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. It has not been cleared or approved by the US Food and Drug Administration.
National University Hospital-Singapore Additional Information:

Last updated 14/07/2026