Test Overview
Test Methodology

Homogeneous Enzyme Immunoassay

Test Usage

Monitor therapeutic drug level, compliance, evaluate valproic acid toxicity

Reference Range *

2-10 mcg/mL (approximately 10% of the total drug concentration); Toxic >15 mcg/mL.

Test Limitations

Use of heparinized blood tubes is not allowed (may lead to artificially high free valproic acid level).

Test Details
Days Set Up
Daily, 24 hrs
Analytic Time

2 hours

Soft Order Code
FVALP
MiChart Code
Valproic Acid Level, Free
Synonyms
  • Depakene
  • Depakene, Protein Free
  • FVALP
  • Free Depakene
  • Free Valproic Acid
Laboratory
Chemical Pathology
Section
Automation
Specimen Requirements
Collection Instructions

Collect blood in a red top tube. Centrifuge, aliquot serum into a plastic vial, and refrigerate.

Alternate Specimen
SST tube
Rejection Criteria
Heparinized samples
Red Top Tube
Normal Volume
1 mL serum or plasma
Minimum Volume
0.75 mL serum or plasma
Billing
CPT Code
80165
Fee Code
33202
LOINC
4087-3
NY State Approved
No