| Ordering Code | 441 |
|---|---|
| Test Name | Phenobarbital |
| Preferred Specimen | Plasma |
| Preferred Container | Lithium Heparin PST (Green) |
| Other Specimen/Container | Serum in Plain (Red), Serum in SST (Gold) |
| Optimum Volume | 0.5 mL |
| Handling Instructions | Send aliquot if transport time >24 hours. |
| Transport Requirements | Oahu: Refrigerated Airline: Frozen |
| Specimen Stability | Refrigerated: 24 Hours (Centrifuged, unaliquoted gel separator tubes) 4 Days (Aliquot) Frozen: 1 Month (Aliquot) Frozen samples should be thawed only once Test cannot be added to >24 hours unaliquoted specimens collected in a gel separator tube. |
| Rejection Criteria | Grossly hemolyzed, Insufficient quantity, Specimen older than stability limits, Uncentrifuged gel separator tube specimens >2 hours old, Unaliquoted gel separator tube specimens >24 hours old |
| Avail. Stat | YES |
| Analytic Time | 1 Day |
| Methodology | Kinetic Interaction of Microparticles in Solution (KIMS) |
Reference range(s)
The reference ranges listed below are valid on this date of November 22, 2025.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Phenobarbital | ALL | 15.0-40.0 | >= 50.0 | 15.0-40.0 | >= 50.0 | ug/mL |
