| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Phenytoin Level
MessageDIL; Dilantin
Test Code
LAB31
CPT Codes
80185
Instructions
"Routine venipuncture; draw just prior to next oral dose. For I.V. administration draw 2-4 hours postdose. . Note: For patients receiving fosphenytoin therapy collect as trough (at least 2 hours after I.V. infusion or at least 4 hours after I.M. injection).
Collect one 4.5ml light green top (heparin) tube, or green Microtainer™or one 5ml Red/gold top serum separator tube,"
Collect one 4.5ml light green top (heparin) tube, or green Microtainer™or one 5ml Red/gold top serum separator tube,"
Specimen Stability
Refrigerate, stable 7 days; stable 4 days at room temperature; stable 6 months if frozen.
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Failure to follow stability requirements
Methodology
Multiple point -immuno rate:The rate of dye formation is inversely propotional to the phenytoin concentration in the sample.
Setup Schedule
Daily
Report Available
"Within 24 hours
STAT: 1 hour after submitted"
STAT: 1 hour after submitted"
Reference Range
"10-20 ug/mL
Critical High Value: >30 ug/mL"
Critical High Value: >30 ug/mL"
Clinical Significance
Falsely elevated phenytoin levels may occur in critically ill uremic patients receiving fosphenytoin.
