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General Information

Mayo Clinic Laboratories

Test Code PBR Phenobarbital, Serum

Useful For

Monitoring for appropriate therapeutic concentration of phenobarbital

 

Assessing compliance or toxicity

Reporting Name

Phenobarbital, S


Specimen Required


Collection 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

Reject Due To

Gross hemolysis Reject

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Specimen Retention Time

1 week

Performing Laboratory

Mayo Clinic Laboratories in Rochester

CPT Code Information

80184

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PBR Phenobarbital, S 3948-7

 

Result ID Test Result Name Result LOINC Value
PBR Phenobarbital, S 3948-7

Specimen Type

Serum

Specimen Stability Information

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

Reference Values

Therapeutic: 10.0-40.0 mcg/mL

Critical value: ≥60.0 mcg/mL

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)