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HelpTest Code VALFR 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
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 |
Reject Due To
|
Hemolysis |
Mild OK; Gross reject |
|
Lipemia |
NA |
|
Icterus |
NA |
|
Other |
NA |
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 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.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 |