Fosphenytoin as Metabolite, Serum/Plasma

Test Code

CPT Codes

Preferred Specimen
1 mL serum collected in a red-top tube (no gel), or plasma collected in an EDTA (lavender-top) or (pink-top) tube

Minimum Volume
0.21 mL

Promptly centrifuge and separate serum or plasma into a preservative-free, plastic screw-capped vial using approved guidelines.

Transport Container
Plastic screw-cap vial

Transport Temperature
Refrigerated (cold packs)

Specimen Stability
Room temperature: 14 days
Refrigerated: 14 days
Frozen: 90 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Polymer gel separation tube (SST® or PST)

High Performance Liquid Chromatography/Tandem Mass Spectrometry

Setup Schedule
Set up: Daily; Report available: 7 days (after set up)

Reference Range
See Laboratory Report

Clinical Significance
Therapeutic Drug Monitoring

Performing Laboratory
National Medical Services
200 Welsh Rd
Horsham, PA 19044

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.