*Primidone Mnemonic PRIM Synonym Mysoline® Includes Primidone metabolite (phenobarb) Guidelines For information on when to collect specimens, please refer to: Therapeutic Drug Monitoring (TDM) Guidelines for Pediatrics and Adults Specimen Collection Requirements Collect Serum or Plasma, one 7.0 mL red, 4.0 mL dark green (sodium heparin), or 4.0 mL lavender (EDTA) top tube Handling Allow serum to clot completely at room temperature (minimum: 30 minutes). Centrifuge and separate serum or plasma within one hour of collection. Preferred Volume 2 mL Serum or Plasma Minimum Volume 0.25 mL (Whole Blood 1.0 mL minimum draw) Transport Refrigerated (2-8°C) Rejection Criteria Serum or Plasma exposed to gel barrier (SST or PST) for more than 24 hours, grossly hemolyzed specimens Stability Ambient (20-25°C): 72 hours; Refrigerated (2-8°C): 1 week; Frozen (at or below -20°C): 3 months Testing Information Performed 7 days/week Reported 24 hours Method Enzyme immunoassay Reference Values Therapeutic Range Please see Therapeutic Drug Monitoring (TDM) Guidelines for Pediatrics and Adults Toxic Levels Please see Therapeutic Drug Monitoring (TDM) Guidelines for Pediatrics and Adults CPT Codes 80184, 80188 Last Updated: Friday, June 21, 2019 01:46:13 AM Client Services: 503-413-1234