ARUP's Laboratory Test Directory

0090202: Primidone & Metabolite

Test Mnemonic: PRIM
Methodology: Fluorescence Polarization Immunoassay

Performed: Sun-Sat

Reported: Within 24 hours

Specimen Required:  
Collect: One 5 mL plain red. Also acceptable: green (sodium heparin).

Transport: 1 mL serum or plasma at 2-8°C. (Min: 0.8 mL) Submit specimen in an ARUP Standard Transport Tube.

Pediatric Collection/Transport: 0.8 mL serum or plasma at 2-8°C.

Remarks: Allow specimen to clot completely at room temperature.  Separate serum from cells ASAP.

Unacceptable Conditions: Separator tubes.

Stability: After separation from cells: Ambient: 1 week; Refrigerated: 3 weeks; Frozen: 6 months

Reference Interval:
 
Test Number Components Reference Interval
 Primidone5-12 µg/mL
0090230Phenobarbital 0-2 months: 15.0-30.0 µg/mL
  Toxic: 40.1 µg/mL or greater 
3 months and older: 15.0-40.0 µg/mL
  Toxic: 50.1 µg/mL or greater

Interpretive Data:
Primidone concentrations greater than 15 µg/mL in conjunction with therapeutic levels of phenobarbital may be associated with toxicity. 



CPT Code(s):
80188 Primidone; 80184 Phenobarbital

 

 

 
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