Free Valproate Level (Unbound)
8 days
Ultrafiltrate assayed by Immunoassay (IA)
Causes for Rejection Gel-barrier tube, Haemolysis, serum or plasma not removed from cells
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Free valproic acid level. Important in highly protein-bound drug monitoring.
Serum or Plasma
3 mL
Red-top tube or lavender-top (EDTA) tube. Do not use a gel-barrier tube.
No special preparation is required for this test. You may eat, drink, and take your medications as normal, unless instructed otherwise by your healthcare provider.
The use of gel-barrier 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.
| Temperature | Period |
|---|---|
| Room temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |
| Freeze/thaw cycles | Stable x3 |