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70321: Ctc-risperidone And Metabolite Print View
Risperidone     ng/mL 
OH-Risperidone     ng/mL 
Risperidone+ OH-Risperidone CALC    ng/mL 

PRIMARY
1 Serum 0.5 (0.2) mL   Refrigerated - 7 Day(s)/Room Temperature - 7 Day(s)/Frozen - 24 Month(s)  
ALTERNATE
  Plasma Heparinized 0.5 (0.2) mL   Refrigerated - 7 Day(s)/Frozen - 24 Month(s)/Room Temperature - 7 Day(s)  

Therapeutic drug monitoring for effective therapy. Risperidone is rapidly converted into its hydroxy metabolite in the liver. Peak concentration of risperidone occurs in about 1 hour following oral administration and for 9-hydroxyrisperidone the peak level is reached at 3 hours (17 hours for poor metabolizers). The elimination half-life of risperidone is 3 hours (20 hours for poor metabolizers), and is 21 hours for hydroxyrisperidone (30 hours for poor metabolizers).
Setup Schedule
Sunday-Saturday

Reported (Analytical Time)
Same day

CPT Code
80342

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

Notes
Risperidone and OH-Risperidone are approximately equally effective; therefore, the sum of their concentrations is reported as total active drug.
Transport Temperature: Room temperature
Reject Criteria: Serum separator tubes are not acceptable
Methodology: Chromatography/Mass Spectrometry






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