Phenobarbital, Free
Test Mnemonic
PHENFR
CPT Codes
- 80184 - QTY (1)
Aliases
- Luminal
- Phenobarb,Unbound
Includes
- Phenobarbital - Unbound
Performing Laboratory
National Med Serv Inc
Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 3 mL | Plasma | Sodium or Lithium heparin (Green) | Refrigerated |
Alternate Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 3 mL | Serum | No additive (Red) |
Minimum Specimen Requirements
| Volume | Type | Container | Collect Temperature | Transport Temperature | Special Instructions |
|---|---|---|---|---|---|
| 1 mL |
Stability
| Environmental Condition | Description |
|---|---|
| Ambient | 3 months |
| Refrigerated | 3 months |
| Frozen | 18 months |
Days Performed
Varies
Turnaround Time
8 - 9 days
Methodology
| Name | Description |
|---|---|
| High Performance Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS) |
Reference Range
| Phenobarbital, Free | |||||
|---|---|---|---|---|---|
| Sex | Age From | Age To | Type | Range | Range Unit |
| Years | 99 Years | Normal | 6.0 - 20.0 | ug/mL | Years | 99 Years | Urgent | > = 25.0 | ug/mL |
Special Info
Gel barrier tubes will be rejected. This test is New York DOH approved.
Clinical Info
Approximately 54% of phenobarbital is unbound to serum proteins (free) at therapeutic concentrations.
Clinical Limitation
Reporting Limit: 0.5 mcg/mL.