Geisinger Medical Laboratories/Geisinger Proven Diagnostics Test Catalog

Test Name: Sunquest Test Code Epic Procedure Code Or ID CPT Code:  


Sunquest Test Code:
RISP      Geisinger Epic Procedure Code: 80299.41         Geisinger Epic ID: 17751

Specimen type:
Preferred collection container:
Specimen required:
3 mL aliquot of serum; minimum 1.5 mL.
Special notes:
The use of serum separator tubes is not acceptable.

Specimen processing instructions:
Allow to clot. Centrifuge 10 minutes at 3000 rpm. 
Transport temperature:
Room temperature.
Specimen stability:
Room Temperature: 7 days. Refrigerated: 28 days. Frozen: 8 weeks (-20°C).
Rejection criteria:
The use of serum separator tubes (SST) is not acceptable. Submission of an SST will result in cancellation.

Reference interval:
Accompanies report.
CPT code(s):
Note: The billing party has sole responsibility for CPT coding.  Any questions regarding coding should be directed to the payer being billed.  The CPT codes provided by GML are based on AMA guidelines and are for informational purposes only.
Test includes:
Liquid Chromatography-Tandem Mass Spectrometry (LC-MS/MS)
Quest test code 14365
Clinical significance:
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 of hydroxyrisperidone (30 hours for poor metabolizers).

Performing Locations

Specialty Labs

Technical Lead: Michael Weaver    
Frequency: Tuesday, Thursday, Saturday morning    
Performed stat? No
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