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HelpTest Code PHENO Phenobarbital
Useful For
Phenobarbital (5-ethyl-5phenylbarbituric acid) is the most effective barbiturate in the long-term treatment of seizure disorders. It is indicated for control in most types of seizures.
Synonyms/Keywords
Phenobarb
Specimen Requirements
| Fasting Required | Specimen Type | Preferred Container/Tube | Acceptable Container/Tube | Specimen Volume | Specimen Minimum Volume (allows for 1 repeat) |
Pediatric Minimum Volume (no repeat) |
|---|---|---|---|---|---|---|
| No | Serum/ Plasma | Serum Separator Tube (SST) | Lithium-heparin Plasma Separator (PST), Red Top Tube (RTT) | 0.5 mL | 0.2 mL | Collect 0.4 mL whole blood (red microtainer) |
Collection/Processing Instructions
Serum or plasma separator tubes must have serum or plasma removed from gel within 1 hour of collection.
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum/ Plasma | Ambient | 24 hours |
| Refrigerate | 7 days | |
| Frozen | 1 year |
Rejection Criteria
Specimens remaining in gel separator tubes longer than 1 hour.
Reference Range Information
| Performing Location | Reference Range |
|---|---|
| All Performing Sites | 15-40 ug/mL See Critical Value List for list of current critical values |
Marshfield Labs Performing Department
Marshfield Labs Chemistry
Performing Information
| Performing Location | Day(s) Test Performed | Analytical Time | Methodology/Instrumentation |
|---|---|---|---|
| Marshfield | Monday through Sunday | Less than 2 hours | Emit* 2000 Rate Assay/Beckman AU |
CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 80184 |
Outreach CPT Codes
| CPT | Modifier (if needed) |
Quantity | Description | Comments |
|---|---|---|---|---|
| 80184 |
Ordering Applications
| Ordering Application | Description |
|---|---|
| Cerner | Phenobarbital Level |