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Test Code PTN Phenytoin, Total, Serum

Methodology

Cloned Enzyme Donor Immunoassay (CEDIA)

Performing Laboratory

St. Clair Hospital Laboratory

Specimen Requirements

Plasma lithium heparin tube preferred or red-top tube 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/mL
Critical value (automatic call-back):  >30.0 µg/mL

Day(s) Test Set Up

Monday through Sunday