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Phenytoin Level, Free
MessagePatient Preparation: Collect as a trough just prior to next Dose. For patients receiving fosphenytoin therapy, collect as peak (at least 2 hours after IV infusion or at least 4 hours after IM injection). Immediate Specimen Processing: Centrifuge specimen and transfer serum to a plastic screw-cap tube prior to transportation. Ambulatory Transport Temperature to Inova Central Lab: AmbientSpecimen Stability: 4 days
Test Code
LAB32 PNYF
Alias/See Also
PNYF
CPT Codes
80186
Includes
Patient Preparation: Collect as a trough just prior to next dose. For patients receiving fosphenytoin therapy, collect as peak (at least 2 hours after IV infusion or at least 4 hours after IM injection).@BKRCERMSGREFRESH(2302793)@ @BKRCERMSGREFRESH(2302794)@
Instructions
Preferred Testing Volume: 2.5 mL serumMinimum Testing Volume: 1 mL serumTransport Temperature: Ambient Stability: Ambient: 4 daysRefrigerated : 7 daysFrozen: 30 days Causes for Rejection: Specimen received in serum separator tube (SST)PlasmaPerforming Lab: Quest Diagnostics Chantilly
Report Available
3-Days
Clinical Significance
1230170310
Last Updated: May 18, 2026