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Phenytoin Level, Free + Total

Mnemonic:    [Pheny F/T]
Name:    Phenytoin Level, Free + Total
Specimen:    2 mL serum from a Red top tube. Do not use GEL barrier tubes. Do NOT use gel tubes. Heparinized plasma is unacceptable.
Minimum Spec:    1 mL
Transport Temp:    Refrigerated
Spec Stability:    Stable 4 days refrigerated.
Ref Lab/Code:    ARUP 0090141
  Method:    Enzyme Multiplied Immunoassay Technique (EMIT)
Note:    Test includes Free and Total Phenytoin. Do not order Phenytoin (Dilantin) in addition to this test.
Processing Info:    Serum in a gel tube stored at room temperature is acceptable if separated from the gel within 2 hours. Serum in a refrigerated gel tube must be separated within one hour.