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PHENYTOIN
MessageCollect as a trough just prior to next dose. For patients receiving fosphenytoin therapy, collect as a trough at least 2 hours after IV infusion or at least 4 hours after IM injection.
Test Code
LAB31
CPT Codes
80185
Preferred Specimen
One 6 mL red top tube
Pediatric: One red top microtainer
Pediatric: One red top microtainer
Other Acceptable Specimens
Dark green top tube
Instructions
Specify dosage history. Time drawn must be written on label.
Sample must be centrifuged within two hours of collection. Serum/plasma (red or dark green top tube) must be removed from the red cells and put into aliquot tubes following centrifugation.
Sample must be centrifuged within two hours of collection. Serum/plasma (red or dark green top tube) must be removed from the red cells and put into aliquot tubes following centrifugation.
Transport Temperature
Refrigerated
Specimen Stability
Unstable, centrifuge within two hours of collection
Ambient: 2 days
Refrigerated: 8 days
Frozen: 5 months
Ambient: 2 days
Refrigerated: 8 days
Frozen: 5 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Samples drawn in tubes containing a separator gel will be rejected. The separator gel may cause falsely lower results.
Methodology
CMIA Chemiluminescent Microparticle Assay
Setup Schedule
Sunday-Saturday
Reference Range
Therapeutic level: 10.0-20.0 ug/mL
Critical level: ≥20.1 ug/mL
Critical level: ≥20.1 ug/mL
Performing Laboratory
West Virginia University Hospital, Inc.
Berkeley Medical Center
Braxton County Memorial Hospital
Camden Clark Medical Center
Jefferson Medical Center
Potomac Valley Hospital
Reynolds Memorial Hospital
Summersville Regional Medical Center
St Joseph's Hospital
United Hospital Center
Wetzel County Hospital
