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Labcorp Oklahoma, Inc.
Test Directory


Index:

Dilantin (Phenytoin) Free and Total

Order Name DILANT F T
Test Number: 3700400
Revision Date 01/03/2022
Test Name Methodology LOINC Code
Dilantin (Phenytoin) Free and Total
Immunoassay (IA)  
SPECIMEN REQUIREMENTS
Specimen Specimen Volume (min) Specimen Type Specimen Container Transport Environment
Preferred 3 mL (2.3 mL) Serum Clot Activator (Red Top, No-Gel) Room Temperature
Instructions Specimen Type: Red-top tube OR green-top (heparin) tube. DO NOT USE A GEL-BARRIER TUBE. The use of gel-barrier tubes is not recommended due to slow absorption of the drug by the gel. Depending on the specimen volume and storage time, the decrease in drug level due to absorption may be clinically significant.
Specimen Storage: Room Temperature
Specimen Collection: Transfer separated serum or plasma to a plastic transport tube. Collect specimen just prior to next dose. Serum or plasma must be separated from cells within 45 minutes of collection. Send serum or plasma in a plastic transport tube.
Special Instructions: This panel is routed to labs that run both free and total. If the work is to be run in separate locations, please order test numbers 007401 and 070763.
Specimen Stability: Ambient: 14 days, Refrigerated : 14 days, Frozen: 14 days
GENERAL INFORMATION
Testing Schedule Tues-Sat 
Expected TAT 2-5 Days  
Performing Labcorp Test Code 070706 
Notes Labcorp Test Code: 070706
CPT Code(s) 80185, 80186
Lab Section Reference Lab