Primidone and Phenobarbital

Message

For Specimen Integrity during Extreme Weather see the “Lockbox Usage in Extreme Weather” document at the top of this page.

Test Code

PRIMD

CPT Codes
80184, 80188

Preferred Specimen

1 mL serum collected in a red-top tube (no gel)

Patient Preparation
Collect as trough just prior to next dose

Minimum Volume

0.2 mL

Other Acceptable Specimens

Plasma collected in: Sodium heparin (green-top) tube, lithium heparin (green-top) tube, or EDTA (lavender-top) tube

Transport Temperature

Refrigerated (cold packs)

Specimen Stability

Room temperature: 72 hours
Refrigerated: 7 days
Frozen: 30 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)

Serum separator tube (SST) • Any serum collection tube with additives

Methodology
Immunoassay (IA)

Setup Schedule

Monday-Saturday Morning
Report available: Next Day

Reference Range

Primidone	5.0-12.0 mg/L
Phenobarbital	15.0-40.0 mg/L

Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Drive
Chantilly, VA 20153

Last Updated: December 6, 2021

The CPT Codes provided in this document are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payor being billed. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.