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SIM
18401
CPT
80186
Synonyms
Free Dilantin®; Free Phenytek® Dilantin-125
Specimen Type
Serum or plasma
Container
Red-top, or green top (sodium heparin) tube
Collection Instructions
Do not use gel barrier tubes
Volume
Volume: 3 ml. Minimum volume: 1.5 ml.
Additional Information
Phenytoin is 90% bound, but only free fraction circulates through plasma membranes and is biologically active.
Patient Preparation
Specimen Processing Instructions
Once in the lab,separate serum from cells and transfer to aliquot tube.
Transport Requirements
Room Temperature or Refrigerated
Specimen Stability
Room Temperature or Refrigerated :14 days
Rejection Criteria
Gel-barrier tube, hemolysis, lipemia; lavender-top tube
Reference Range
Reference range accompanies report
Critical Value
Test Includes
Free phenytoin level
Methodology
Ultrafiltrate assayed by immunoassay
Testing Frequency
LCA
070763
Reviewed By
Lisa McBride
Reviewed Date
6/27/2018
Supplemental
* Denotes Reference Lab Test
Reviewed by Lisa McBride on June 27, 2018
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