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About This Test

Department: Biochemistry (referred)


  • EDTA (purple top)

Dedicated sample required


Turnaround Time:

6 - 8 weeks


Monitoring of patients on clozapine

In most cases, WBC can be monitored weekly to identify agranulocytosis. If clozapine analysis is required, please supply request form ( and quote patient’s clozapine registration number.

Pre-dose sample preferred

Other Comments:

Analysed at Toxicology Department at King's Hospital, King's College Hospital, Bessemer Wing - 3rd Floor, Denmark Hill, London, SE5 9RS


Interpretive comments provided by referral laboratory