Clozapine and Metabolites, Serum or Plasma, Quantitative

2013433
copy
 

Copy Utility


emailprint
Example Reports
High
Normal

Ordering Recommendation

Optimize drug therapy and monitor patient adherence.

Mnemonic

CLOZAP SP

Methodology

Quantitative Liquid Chromatography-Tandem Mass Spectrometry

Performed

Sun-Sat

Reported

1-3 days

New York DOH Approval Status

This test is New York DOH approved.

Specimen Required

Patient Preparation

Timing of specimen collection: Pre-dose (trough) draw - At steady state concentration.

Collect

Plain red. Also acceptable: Lavender (K2 or K3EDTA) or pink (K2EDTA).

Specimen Preparation

Separate serum or plasma from cells within 2 hours of collection. Transfer 1 mL serum or plasma to an ARUP Standard Transport Tube. (Min: 0.5 mL)

Storage/Transport Temperature

Refrigerated.

Unacceptable Conditions

Whole blood. Gel separator tubes, light blue (citrate), or yellow (SPS or ACD solution).

Remarks
Stability

After separation from cells: Ambient: 5 weeks; Refrigerated: 2 months; Frozen: 2 months

Reference Interval

Therapeutic Range Not well established
Toxic Level Total Clozapine and Metabolites: Greater than or equal to 1500 ng/mL

Interpretive Data

Therapeutic ranges are not well established. Clozapine is metabolized to norclozapine and clozapine-N-oxide. Clozapine concentrations between 100 and 700 ng/mL may correlate more with clinical response; however, non-responsiveness may also occur within this range. For refractory schizophrenia, clozapine concentrations greater than 350 ng/mL are suggested to achieve a therapeutic response.

Toxicity: Adverse effects to clozapine therapy may include tachycardia, drowsiness, hypotension, and seizures.

Therapeutic and toxic ranges are not well established in children.

This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.

Compliance Category

Laboratory Developed Test (LDT)

Note

Hotline History

N/A

CPT Codes

80159

Are you an ARUP Client? Click here for your pricing.

Components

Component Test Code* Component Chart Name LOINC
2013458 Clozapine, S/P, Quant 6896-5
2013459 Norclozapine, S/P, Quant 10992-6
2013460 Clozapine-N-Oxide, S/P, Quant 85497-6
2013461 Total Clozapine and Metabolites 12375-2
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.

Aliases

  • Clopine
  • Clozaril
  • Denzapine
  • FazaClo
  • Versacloz
  • Zaponex
Clozapine and Metabolites, Serum or Plasma, Quantitative