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HelpTest Code VALP Valproic Acid, Total, Plasma
Additional Codes
LAB24
Performing Laboratory
Central Peninsula Hospital
Important Notes
Valproic Acid, Total, Plasma test is for medical use only.
Collection Instructions
Draw trough levels immediately prior to next dose.
Collection Method
Venipuncture
Container
Lt Green / Plasma Separator / Lithium Heparin
Specimen Type
Preferred
- Plasma- Light Green Top
Acceptable
- Serum- Gold Top SST or Red Top
Minimum Volume
0.5ml
Specimen Stability
| Ambient | 2 days |
| Refrigerated (4°C to 8°C) | 7 days |
| Frozen(-40°C to 0°C) | 3 months |
Reference or Target Ranges
50 – 100 μg/mL
Peak: 3 - 4 hours post oral dose
Trough: Just prior to next dose
Reportable Units
μg/ml
Critical Value
trough ≥ 150 µg/ml
Reasons for Rejection
| Hemolysis Threshold | 500 mg/dL |
| Icterus Threshold | 30 mg/dL |
| Lipemia Threshold | 500 mg/dL |
| Other | QNS, contaminated, improperly labeled, improper specimen type |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time |
Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Roche Cobas |
CPT Codes
80164
Last review/edit date
2025