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Labcorp Oklahoma, Inc.
Test Directory


Valproic Acid (Depakene), Free and Total

Order Name Valproic F/T
Test Number: 5613579
Revision Date 10/01/2023
Test Name Methodology LOINC Code
Valproic Acid (Depakene), Free and Total
Immunoassay (IA)  
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 2.7 mL (1.4 mL) Serum Clot Activator (Red Top, No-Gel) Refrigerated
Instructions Specimen Type: Red-stopper tube or green-stopper (heparinized plasma) tube. Transfer separated serum or plasma to a plastic transport tube. Do not use a serum separator tube; the use of serum separator tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant. significant.
Specimen Storage: Refrigerate
Specimen Collection: Oral: peak: 1-4 hours after dose (influenced by meals); trough: immediately prior to next dose (possibly more useful than peak values)
Special Instructions: Refrigerate
Stability: Room Temp 14 Days; Refrigerated 14 Days; Frozen 14 Days (Freeze/Thaw Cycle: Stable x3)
Expected TAT 4-6 Days  
Clinical Use Depakene (Valproic Acid) and Depakote (Divalproex Sodium) are closely-related drugs used for the treatment of petit mal, grand mal, mixed and akinetic-myoclonic seizures. 
Performing Labcorp Test Code 706499 
CPT Code(s) 80164, 80165
Lab Section Reference Lab