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Test Code PRIMD Primidone and Phenobarbital, Serum

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Reporting Name

Primidone and Phenobarbital, S

Useful For

Assessing compliance

 

Monitoring for appropriate therapeutic levels of primidone and phenobarbital

 

Assessing toxicity

Profile Information

Test ID Reporting Name Available Separately Always Performed
PRIMD Primidone, S No Yes
PBR Phenobarbital, S Yes Yes

Testing Algorithm

Includes phenobarbital determination.


Specimen Required


Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 0.5 mL

Collection Instructions:

1. Serum gel tubes should be centrifuged within 2 hours of collection.

2. Red-top tubes should be centrifuged, and the serum aliquoted into a plastic vial within 2 hours of collection.


Specimen Minimum Volume

0.25 mL

Specimen Type

Serum

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 7 days
  Frozen  28 days
  Ambient  72 hours

Day(s) Performed

Monday through Sunday

Reference Values

Primidone

Therapeutic: 5.0-12.0 mcg/mL

Critical value: ≥15.0 mcg/mL

 

Phenobarbital

Therapeutic: 10.0-40.0 mcg/mL

Critical value: ≥60.0 mcg/mL

Test Classification

This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

Method Name

PRIMD: Immunoassay

PBR: Kinetic Interaction of Microparticles in a Solution (KIMS)

CPT Code Information

PRIMD-80188

PBR-80184

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PRMB Primidone and Phenobarbital, S 10547-8

 

Result ID Test Result Name Result LOINC Value
PBR Phenobarbital, S 3948-7
PRIMD Primidone, S 3978-4

Report Available

Same day/1 day

Forms

If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:

-Neurology Specialty Testing Client Test Request (T732)

-Therapeutics Test Request (T831)