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Lab Test Dictionary

Phenytoin, Free (3189X)

Methodology

Ultrafiltration; Immunoassay (IA)


Synonyms

Dilantin

Specimen Type

Serum

Performing Lab

Quest Diagnostics Chantilly


Epic ID

LAB01522

Lab Test Days

Monday-Saturday

Standard TAT

1 Day


Collection Information

Specimen Required

2-5 mL Blood

Collection Instructions

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).


Processing Information - Lab Use Only

Transport Temperature

Refrigerate-OK/Frozen-OK

Specimen Stability

Room Temp=4 Days; Refrigerated=7 Days; Frozen=30 Days

Rejection Criteria

Serum separator tubes (SST); Plasma

Test Volume Required

2.5 mL Serum

Minimum Test Volume

1 mL Serum


CPT Codes

80186


Revised

02-23-20

Initials

SL