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HelpTest Code LAB5063 Dilantin (Phenytoin)
Useful For
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.
Performing Laboratory
Asante Rogue Regional Medical Center / Asante Three Rivers Medical Center
Performing Department
Chemistry
Specimen Required
For TROUGH level, draw immediately prior to next dose
Please provide dose information
RRMC:
(submit one of the following)
Lithium Heparin Green top tube
TRMC:
Specimen Minimum Volume
0.5 ml
Neonatal minimum volume: 0.4 mL whole blood
Specimen 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
Reject Due To
- Icterus
- Lipemia
- Hemolysis
- Quantity not sufficient (QNS)
- Lack of Two Patient Identifiers:
- 1-Patient's First & Last name
- 2-Patient's Date of Birth
Day(s) Performed
Monday through Sunday
Turnaround time:
Routine – 4 hour after receipt of specimen in lab
STAT - 1 hour after receipt of specimen in lab
Method Name
Turbidimetric Inhibition Immunoassay
CPT Code Information
80185 - Phenytoin; total
Billing Code
2050516