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Lab Dept:
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Chemistry
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Test Name:
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DILANTIN, FREE
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General Information
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Lab Order Codes:
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FDIL
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Synonyms:
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Dilantin®; DPH; PHT ;Dilantin, Unbound; Phenytoin, Free
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CPT Codes:
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80186 – Phenytoin; free
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Test Includes:
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N/A
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Logistics
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Test Indications:
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Useful for therapeutic drug monitoring (TDM).
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Lab Testing Sections:
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Chemistry - Sendouts
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Referred to:
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MedTox Laboratories (Test# 98)
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Phone Numbers:
Minneapolis:
Saint Paul:
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612-813-6280
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651-220-6550
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Test Availability:
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Daily, 24 hours
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Turnaround Time:
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1 day
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Special Instructions:
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Trough levels are most reproducible.
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Specimen
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Specimen Type:
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Whole blood
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Container:
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Green top (Li Heparin) or Red top tube
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Draw Volume:
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9.0 mL (Minimum: 2.0 mL) blood
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Processed Volume:
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3.0 mL (Minimum: 0.6 mL) serum/plasma
Note: Submission of the minimum volume results in an elevated reporting limit and inability to repeat analysis.
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Collection:
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Routine venipuncture
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Special Processing:
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Lab Staff: Centrifuge specimen, remove serum/plasma aliquot into a screw-capped round bottom plastic vial. Store and ship at refrigerated temperatures. Forward promptly.
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Patient Preparation:
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None
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Sample Rejection:
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N/A
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Interpretive
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Reference Range:
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1.00 – 2.00 µg/mL
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Critical Values:
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>4.00 µg/mL
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Limitations:
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0.5 µg/mL reporting limit
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Methodology:
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Ultrafiltration. Immunoassay (IA)
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Contraindications:
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N/A
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References:
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MedTox Laboratories Web Page www.medtox.com
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