Test directory: Clozapine & Norclozapine

Ordering Code 4644
Test Name Clozapine & Norclozapine
Alias Clozaril
Preferred Specimen Plasma
Preferred Container EDTA, K2 (Lavender)
No gel barrier tubes.
Other Specimen/Container Plasma in Lithium Heparin (Green), Plasma in Sodium Heparin (Green), Serum in Plain (Red)
Optimum Volume 2 mL
Collection Instructions Do Not use SST
Do Not use PST
Optimum time to collect sample is 1-2 hours prior to the next dose.
Transport Requirements Oahu: Frozen
Airline: Frozen
Specimen Stability Ambient: 24 Hours
Refrigerated: 5 Days
Frozen: 30 Days
Rejection Criteria Gel barrier tube, Grossly hemolyzed, Serum separator tube
Avail. Stat NO
Analytic Time Up to 7 Days
Methodology Liquid Chromatography Tandem Mass Spectrometry (LC/MS/MS)
Reference Lab  Quest Diagnostic Lab-NI

Reference range(s)

The reference ranges listed below are valid on this date of June 29, 2025.
Component Age Male Norm Male Critical Low Male Critical High Female Norm Female Critical High Female Critical Low Units Add'l info
Norclozapine ALL See report.
Clozapine, Plasma ALL See report.