Tests:Phenytoin, Plasma: Difference between revisions

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Tests:Phenytoin, Plasma
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Revision as of 12:32, 12 September 2025

Overview

Department Biochemistry
Test Code PHTN
Synonyms Dilantin 
Availability Monday - Sunday, testing routinely available out of hours
Turnaround Time 1 - 2 hours
Stability – Add test

Specimen Requirements

Specimen Serum

Plasma

Preferred 6 mL Plain Red-Top</span
Acceptable 6 mL Li-Hep Green-Top   
Unacceptable
Specimen Transportation Sample should be ideally collected immediately before next dose 
Paediatric Requirements 600 μL  Li-Hep Microtainer

Aliquot Requirements

Sample
Preferred Volume
Minimum Volume 1 mL 
Aliquot Transportation

Clinical Information

Reference Intervals Reference Range: 40 - 80 umol/L (For trough levels) 
Test Method Roche Cobas 6000 using Roche Online reagents 
Advanced Notice
Patient Preparation

Comments

Please supply last dosage details (time, date and dose) where possible, and collect sample immediately prior to next dose. 
Owner Clair Crossley (Crossley1)
Last reviewed 12.09.2025
Next review 12.09.2026 (Overdue)