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25056 Valproic Acid, Free (131)

Valproic Acid, Free (131)
Test Code: VPAFSO
Synonyms/Keywords
Depakene, VPA
Specimen Requirements
​ ​Collect Serum OR Plasma​ ​ ​ ​ ​
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Serum​ ​Red Top Tube (RTT) ​ ​3 mL ​1 mL ​
​Plasma ​Lithium-heparin Green Top tube or Sodium-heparin Green Top Tube (GTT) ​ ​3 mL ​1 mL ​
Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​

Ambient temperature is acceptable for

shipping and/or short-term storage ​

 ​3 days
Refrigerated​ 2 weeks​
​Frozen ​6 months
Rejection Criteria
​Serum Separator Tube (SST) not acceptable.
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ 1 day​
Ultrafiltration; Immunoassay (IA)​
Reference Lab
Medtox Laboratories
Reference Range Information
Performing Location Reference Range
Medtox Laboratories​
Reference Range
6.0 - 20.0 ug/mL
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80165 ​ ​ ​ ​
Synonyms/Keywords
Depakene, VPA
Ordering Applications
Ordering Application Description
​Centricity ​Valproic Acid-Free (131)
​Cerner ​Valproic Acid-Free (131)
If the ordering application you are looking for is not listed, contact your local laboratory for assistance.
Specimen Requirements
​ ​Collect Serum OR Plasma​ ​ ​ ​ ​
Specimen Type Preferred Container/Tube Acceptable Container/Tube Specimen Volume Specimen Minimum Volume
(allows for 1 repeat)		 Pediatric Minimum Volume
(no repeat)
Serum​ ​Red Top Tube (RTT) ​ ​3 mL ​1 mL ​
​Plasma ​Lithium-heparin Green Top tube or Sodium-heparin Green Top Tube (GTT) ​ ​3 mL ​1 mL ​
Specimen Stability Information
Specimen Type Temperature Time
​Serum or Plasma ​

Ambient temperature is acceptable for

shipping and/or short-term storage ​

 ​3 days
Refrigerated​ 2 weeks​
​Frozen ​6 months
Rejection Criteria
​Serum Separator Tube (SST) not acceptable.
Reference Range Information
Performing Location Reference Range
Medtox Laboratories​
Reference Range
6.0 - 20.0 ug/mL
For more information visit:
Performing Laboratory Information
Performing Location Day(s) Test Performed Analytical Time Methodology/Instrumentation
Medtox Laboratories​ Performed daily​ 1 day​
Ultrafiltration; Immunoassay (IA)​
Reference Lab
Medtox Laboratories
For billing questions, see Contacts
Outreach CPTs
CPT Modifier
(if needed)		 Quantity Description Comments
​80165 ​ ​ ​ ​
For most current information refer to the Marshfield Laboratory online reference manual.