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HelpTest Code LAB5063 Dilantin (Phenytoin)
Performing Laboratory
Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center
Specimen Minimum Volume
0.5 ml
Billing Code
2050516
Methodology
Turbidimetric Inhibition Immunoassay
Specimen Requirements
For TROUGH level, draw immediately prior to next dose
Please provide dose information
RRMC:
Lithium Heparin Green top tube
TRMC:
Performing Department
Chemistry
Day(s) Test Set Up
Monday through Sunday
Routine – same day
ASAP – 2 hours after receipt of specimen in lab
STAT – 1 hour after receipt of specimen in lab
Test Classification and CPT Coding
80185 - Phenytoin; total
Additional Information
Phenytoin is chemically related to the barbiturates. Its anticonvulsant properties seem to be related to depression of seizure activity in the motor cortex of the brain. Metabolism of the drug may be accelerated by the concurrent administration of barbiturates and slowed by coumadin anticoagulants, disulfiram, phenylbutazone, sulfaphenazole and isoniazid.
Specimen Transport Temperature and Stability
Centrifuge and refrigerate within 2 hours of collection
Primary tube: Spun SST stable 24 hours at 2° to
8° C
Serum stable 48 hours if aliquoted and refrigerated at 2° to 8° C
Reasons for Rejection
Icterus
Lipemia
Hemolysis
Quantity not sufficient (QNS)
Lack of Two Patient Identifiers:
1-Patient's First & Last name
2-Patient's Date of Birth