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Test Mnemonic VALPF Valproic Acid, Free, Serum

Useful For

Monitoring free valproic acid in therapy

 

Assessing compliance

 

Evaluating potential toxicity

Method Name

Ultrafiltration Followed by Immunoassay

Reporting Name

Valproic Acid, Free, S

Specimen Type

Serum


Specimen Required


Container/Tube:
Preferred:
Serum gel
Acceptable: Red top
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 aliquoted within 2 hours of collection.


Specimen Minimum Volume

1 mL

Specimen Stability Information

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

Reference Values

Therapeutic: 5-25 mcg/mL

Critical value: >30 mcg/mL

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Performing Laboratory

Mayo Medical Laboratories in Rochester

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.

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