Test Code VALP VALPROIC ACID
Additional Codes
LAB25
Performing Laboratory
Porter Hospital Laboratory
Specimen Requirements
Specimen Type: Blood
Container/Tube: Tiger top, serum gel
Also Acceptable: Green top (Lithium Heparin)
Specimen Volume: Full tube, submit 0.4 mL serum
Specimen Minimum Volume: 0.35 mL
Collection Instructions:
1. Send specimen in original tube.
2. If there is a delay in transport of >1 hour, centrifuge tube.
3. Centrifuged samples are stable for:
• 8 hours at room temperature
• 2 days at 2 – 8º C
For longer storage, freeze at -20ºC or colder.
Specimen Transport Temperature
Refrigerated
Test Schedule / Analytical Time / Test Priority / Turn around Time
Daily / 24 Hours / Available STAT / Routine - 4 Hours
STAT - 60 Minutes
Test Classification and CPT Coding
80164
Normal Reference Values
50-100 mcg/mL
Critical Values
*New range as of 3/17/2025
* 0 - 18 years: ≥125 ug/mL
18 years and up: >150 µg/mL