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HelpTest Code PTN Phenytoin, Total, Serum
Methodology
Cloned Enzyme Donor Immunoassay (CEDIA)Performing Laboratory
St. Clair Hospital LaboratorySpecimen Requirements
1 plain, red-top tube (1 mL of serum) drawn 12 to 15 hours after last dose. (Serum gel tube is not acceptable.) Centrifuge blood as soon as possible, or send unspun blood to laboratory within 4 hours of draw.Reference Values
Therapeutic concentration: 10.0-20.0 µg/mLCritical value (automatic call-back): >30.0 µg/mL