Valproic Acid, Free

Abbrev Code:VALPFR   
Order Code:LAB5847Order Name:Valproic Acid Free
Synonyms:Free Depakene; Free Depakote
Methodology:Ultrafiltration; Immunoassay
CPT Codes: 80165 x1
Turnaround Time:Routine specimens are sent to reference laboratory Mon-Fri; results are reported within 1-3 days. Stat specimens are sent to the reference laboratory 24/7; results are reported the same day.
Special Instructions:If inpatient, send specimens STAT to MedTox using the OnTime courier on all shifts. See Associated Links.
Associated Links:

OnTime Stat Courier for the East Core Lab

Collection Instructions

Optimal Volume:6 mL
Minimum\Peds Volume:2.2 mL
Container:Red (no gel)
Alternate Containers: Green (lithium heparin, no gel), Green (sodium heparin, no gel)
Collection Instructions:Trough level is preferred; collect immediately prior to next dose.
Causes for Rejection:Results may be altered if collected in gel tube.

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 3 mL, 1 mL minimum. Store in refrigerator. UMMC see Special Instructions.
Shipping Instructions:Ship at room temperature.
Stability:Up to 3 days at room temperature; for longer storage refrigerate or freeze.
Test Performed at or Referral Lab Lab Sendouts  (MedTox/LabCorp)
Referral Lab number:700695 (131)


Critical Range:Greater than 40 ug/mL
Reference Range:6-20.0 ug/mL
Use:Evaluate free drug level and potential toxicity.

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