Epic Code LAB1231994 Phenobarbital, Total/Unbound, S/P

Test Name Alias

LAB1231205 | PHENOT/U/B | Quest: 3238 | Luminal, Barbital, Solfoton, Donnatal, Bellatal, Phenobarbital, free and total

Interface Order Alias

1231994

Clinical Information

Phenobarbital is a general CNS suppressant that has proven effectiveness in the control of generalized and partial seizures. Unbound drug levels are theoretically more closely correlated to therapeutic effect. This assay is used for the therapeutic monitoring and toxicity assessment of unbound phenobarbital.

Specimen Requirements

Specimen Collection Criteria

Collect (preferred specimen): One plain Red-top tubes.
Also acceptable: One Lavender-top EDTA tubes or One Pink top (EDTA)

Do not use Serum Separator Tubes.

Physician Office/Draw Specimen Preparation

Centrifuge to separate serum or plasma from cells. Transfer serum or plasma to a plastic transport tube and room temperature (20-26°C or 68-78.8°F)

In-Lab Processing

Centrifuge to separate serum or plasma. Transfer serum or plasma to a plastic transport tube and room temperature (20-26°C or 68-78.8°F)

Specimen Transport Temperature

Transport: 2.0 mL serum or plasma room temperature (20-26°C or 68-78.8°F) (Minimum: 1.0 mL)

Rejection Criteria

Serum Separator (SST) tubes.
Specimens not collected and processed as indicated.

Specimen Stability

Specimen Stability for Testing:
Room Temperature (20-26°C or 68-78.8°F): 3months
Refrigerated (2-8°C or 36-46°F): 3 months
Frozen (-20°C/-4°F or below): 18 months

Specimen Storage in Department Prior to Disposal:
Specimen retention time is determined by the policy of the reference laboratory. Contact the Send Outs Laboratory with any questions.

Test Frequency

Performed: Daily.
Results available in 7-10 days.

Reference Range

By report.

Performing Department

Send Outs

Performing Department Laboratory Location

Sent to Quest Diagnostics- Wood Dale, IL and forwarded to NMS Labs, Horsham, PA

Methodology

High Performance Liquid Chromatography (HPLC). Tandem Mass Spectrometry.

CPT

80184

LOINC

Unavailable

Reviewed Date

11/8/2025

Orderable Regions