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Phenytoin (Dilantin), Free and Total

Phenytoin (Dilantin), Free and Total

Alternate Test Name

Phenytoin Free and Total Blood Level

Epic Mnemonic
Sunquest Mnemonic

LAB32
FDILB

Category

Sendouts

Methodology

Kinetic Interaction of Micro particles in a Solution (KIMS)

Test Performance Schedule

Available daily

Result Availability

1 - 2 days

Specimen Required

Container

Mint Green top (Lithium Heparin) or Gold top (SST) tube

Volume

Pref. Vol.: 4.5 mL
Min. Vol.: 1.0 mL

Collection Instructions

• Routine venipuncture
• Indicate date and time of last dose
• Immediately after collection, gently invert tube 5-10 times
• Clot 30 minutes
• Centrifuge within 2 hours of collection
• Transfer plasma/serum to plastic aliquot tube
• Refrigerate

Transportation Instructions

Refrigerated

Stability

After separation from cells:
• Room temperature: 8 hours
• Refrigerated: 24 hours (48 hours if aliquoted plasma/serum)
• Frozen: Aliquot plasma/serum for longer storage

Causes for Rejection

• Gross hemolysis
• Specimen not centrifuged within 2 hours of collection

CPT Codes

80186 – Phenytoin Free
80185 – Phenytoin Total

Effective/Revised

11/19/2019

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