Lab Test Details
|
SIM |
LAB176 |
|
CPT |
80185, 80186 |
|
Synonyms |
Dilantin-125®, Dilantin®, Free and Total Phenytoin, Phenytek® |
|
Specimen Type |
Serum or plasma |
|
Container |
Red-top tube or green-top (heparin) tube. Do not use a gel-barrier tube. |
|
Collection Instructions |
Transfer separated serum or plasma to a plastic transport tube. Collect specimen just prior to next dose. Serum or plasma must be separated from cells within 45 minutes of collection. |
|
Volume |
Volume: 3 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 |
|
Reference Range |
Reference range accompanies report |
|
Critical Value |
|
|
Test Includes |
Free and total phenytoin level |
|
Methodology |
Total: immunoassay; Free: ultrafiltrate assayed by immunoassay |
|
Testing Frequency |
|
|
LCA |
070763 |
|
Reviewed By |
Rhonda Crowe |
|
Reviewed Date |
2/27/23 |
|
Supplemental |
* Denotes Reference Lab Test |