VALPROIC ACID TOTAL AND FREE

Specimen Required
Draw blood in a red-top tube, 1 hour before next dose (trough). Centrifuge, remove serum from cells, and send 3.0 mL serum (1.5 mL minimum) refrigerated in a screw-capped plastic vial.

Alternate Specimen
Plasma: EDTA (lavender)

Rejection Criteria
SST, PST

Methodology
Immunoassay

Stability
Room temperature: 48 hours; Refrigerated: 7 days; Frozen: 30 days

Reference Range
By report

Performed
Monday-Saturday

Turnaround Time3-5 days
Test CodeVALTF
CPT-4 Code (s)
80164, 80165
LOINC Codes
Valproic Acid, Free:   4087-3  
Valproic Acid:   4086-5  

Warde
Medical
Laboratory