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Test ID PBR Phenobarbital, Serum

Useful For

Monitoring for appropriate therapeutic concentration of phenobarbital


Assessing compliance or toxicity

Method Name

Kinetic Interaction of Microparticles in a Solution (KIMS)

Reporting Name

Phenobarbital, S

Specimen Required


Preferred: Serum gel

Acceptable: Red top

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 aliquoted within 2 hours of collection.

Specimen Minimum Volume

0.25 mL

Day(s) Performed

Monday through Sunday

Report Available

Same day/1 day

Performing Laboratory

Mayo Clinic Laboratories in Rochester

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.

CPT Code Information


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

NY State Approved


Specimen Type


Specimen Stability Information

Specimen Type Temperature Time Special Container
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


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)