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HelpTest Code 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, SSpecimen Type
SerumSpecimen 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 Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum | Refrigerated (preferred) | 14 days | |
| Frozen | 28 days | ||
| Ambient | 72 hours |
Reject Due To
| Gross hemolysis | Reject |
Reference Values
Therapeutic: 5-25 mcg/mL
Critical value: >30 mcg/mL
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 dayPerforming Laboratory
Mayo Clinic 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. This test has not been cleared or approved by the US Food and Drug Administration.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 |
Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.