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HelpTest Code PHNO Phenobarbital Level
EHR Test Codes
| Test Code | Test Name | |
| Atlas | PHNO | Phenobarbital |
| Cerner | Phenobarbital Level |
Specimen Requirements
Preparation of Patient:
Collect a specimen representing the trough level just before the next dose
Container Type:
Green Top 5mL Lithium Heparin Separator Tube
Or
Gold Top 6mL SST Gel & Clot Activator Tube
Specimen Type:
Plasma or Serum
Specimen Volume:
2.5 mL Plasma or Serum minimum .5 mL
Specimen Handling/Transport:
Separate plasma or serum from cells within 2 hours of collection.
Transport ambient room temperature or refrigerated 2 - 8°C if > 72 hours.
Specimen Stability/Storage:
72 hours ambient room temperature
5 days refrigerated 2-8°C
Performing Laboratory
Munson Medical Center Laboratories
Chemistry Department
Priority, Frequency, & Turnaround
Priority:
STAT, ASAP, Non-Emergent
Frequency:
24 hours 7 days a week
Turnaround:
0 - 1 days
STAT 45 minute from receipt in lab
Methodology
Emit 2000 enzyme immunoassay
Reporting
Reference Range:
15 -40 ug/mL
Critical Decision:
0 years to 21 years > 40 ug/mL
21 years and up > 60 ug/mL
Note: Critical values are called to the provider and communicated as critical. Documentation of the call is recorded in the patient record.
Clinical Significance
Phenobarbital has anticonvulsant activity not shared by most other barbiturates. It is particularly useful in grand mal and focal seizures and in seizures due to withdrawal of alcohol or barbiturates employed in the assay.
CPT Code(s)
80184