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St. John Health System
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Clozapine (Clozaril)

Order Name CLOZAPINE
Test Number: 4006865
Revision Date 10/17/2017
Test Name Methodology LOINC Code
Clozapine (Clozaril)
Liquid Chromatography/Tandem Mass Spectrometry  
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 1mL (0.3 mL) Serum Clot Activator (Red Top, No-Gel) Room Temperature
Instructions Specimen Type: Red-top tube, lavender-top (EDTA) tube OR green-top (heparin) tube. DO NOT USE A GEL-BARRIER TUBE. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.
Specimen Storage: Room Temperature
Specimen Collection: Transfer separated serum or plasma to a plastic transport tube.
Specimen Stability: Ambient: 14 days, Refrigerated : 14 days, Frozen: 14 days
GENERAL INFORMATION
Expected TAT 2-4 Days 
Clinical Use Clozapine is an atypical antipsychotic agent. Norclozapine has minimal therapeutic activity. 
Notes Labcorp Test Code: 706440
CPT Code(s) 80159
Internal Comments Group Test
(Change CPT from 80154 to 83789 on 11/19/2012).
2/9/15  83789 to 80299  - then to 80159 where NMS actuall performs test -JK
10/17/17 update link - JK
Service Provided By Labcorp Oklahoma, Inc.
Lab Section Reference Lab