Phenytoin, Free QPHENF

Method(s) Ultrafiltration/Immunoassay
Synonym Dilantin
Specimen Required
Collect

One 5 mL plain red (no gel) top tube.

Transport

2.5 mL serum ambient (Min: 1 mL).

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 injections).
Stability

Ambient: 4 days

Refrigerated: 7 days

Frozen: 30 days

Unacceptable Conditions
  • Specimen received in serum separator tube (SST)
  • Plasma
Schedule Mon-Sat; Report available: 3-4 days
CPTCode 80186
Notes

Performing Laboratory-Quest Diagnostics-Chantilly VA

Preferred Specimen Collection Device(s)
Reference Interval

1.0-2.0 mg/L

No Appointment Necessary
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12 Patient Service Centers in Central New York.

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