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Phenytoin, Free, Bound, and Total
Test Code94572
CPT Codes
80185, 80186
Includes
Phenytoin, MEIA
Phenytoin, free, Immunoassay
Bound Phenytoin
Phenytoin, free, Immunoassay
Bound Phenytoin
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 (SST) • Plasma
Methodology
Immunoassay (IA) • Microparticle Enzyme Immunoassay (MEIA)
Setup Schedule
Set up: Mon-Fri; Report available: Next day
Reference Range
See Laboratory Report
Performing Laboratory
Quest Diagnostics Nichols Institute
14225 Newbrook Dr
Chantilly, VA 20153