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Test Code VALF Valproic Acid, Free, Serum

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Reporting Name

Valproic Acid, Free, S

Useful For

Monitoring free valproic acid in therapy

 

Assessing compliance

 

Evaluating potential toxicity


Specimen Required


Collection Container/Tube:

Preferred: Serum gel

Acceptable: Red top

Submission Container/Tube: Plastic vial

Specimen Volume: 2 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

1 mL

Specimen Type

Serum

Specimen Stability Information

Specimen Type Temperature Time
Serum Refrigerated (preferred) 14 days
  Frozen  28 days
  Ambient  72 hours

Day(s) Performed

Monday through Sunday

Reference Values

Therapeutic: 5-25 mcg/mL

Critical value: >30 mcg/mL

Test Classification

This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.

Method Name

Ultrafiltration Followed by Immunoassay

CPT Code Information

80165

LOINC Code Information

Test ID Test Order Name Order LOINC Value
VALPF Valproic Acid, Free, S 4087-3

 

Result ID Test Result Name Result LOINC Value
VALPF Valproic Acid, Free, S 4087-3

Report Available

Same day/1 day

Forms

If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.