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Phenytoin, Free, Bound, and Total
Test CodePHFBT
Alias/See Also
94572
CPT Codes
80185, 80186
Includes
Profile composed of Phenytoin, MEIA (Automated Chemistry); Phenytoin, free, Immunoassay (Clinical Toxicology); Bound Phenytoin (calculation)
Preferred Specimen
2.5 mL serum collected in a red-top tube (no gel)
Patient Preparation
Collect as 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).
Minimum Volume
2 mL
Transport Temperature
Room temperature
Specimen Stability
Room temperature: 4 days
Refrigerated: 7 days
Frozen: 30 days
Refrigerated: 7 days
Frozen: 30 days
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Serum separator tube • Plasma
Methodology
Immunoassay (IA) • Microparticle Enzyme Immunoassay (MEIA)
Setup Schedule
Set up: Mon-Fri; Report available: Next day after receipt at the performing laboratory. Add two (2) days for transport.
Reference Range
See Laboratory Report
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Dr
Chantilly, VA 20153
Last Updated: May 4, 2023