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Lab Test Dictionary

Clobazam and Metabolite, Serum (CLOBZ)


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


Frisium; Norclobazam; Onfi; N-desmethylclobazam

Specimen Type


Performing Lab

Mayo Medical Lab

Epic ID

Other Reference Test

Lab Test Days

Monday-Friday; 5 P.M.

Standard TAT

1-5 Days

Collection Information

Specimen Required

1-2 mL Blood

Container Type

Red Top (No Additive)

Collection Instructions

Trough specimens are recommended as therapeutic ranges are based on specimens drawn at trough (immediately before the next does).

Processing Information - Lab Use Only

Transport Temperature


Specimen Stability

Room Temp: 28 Days; Refrigerated: 28 Days (Preferred); Frozen: 28 Days

Test Volume Required

0.5 mL Serum

Minimum Test Volume

0.35 mL Serum

Processing Instructions

Separate serum within 2 hours of collection. Order in Mayolink and send with Mayo courier Monday-Friday.

Included Tests

Clobazam and N-desmethylclobazam.

CPT Codes