PHENYTOIN
Phenytoin, Total, Serum or Plasma
EPIC Test Procedure Code: LAB2328
Synonyms:
Dilantin
PTN
Performing Lab:
Saint Luke's Regional Laboratories
Patient Preparation:
The recommended draw time for a therapeutic drug level is immediately prior
to the next dose (trough specimen).
Container Type:
Plain red top tube, serum red gel tube or green top (heparin) tube
Specimen Type:
Serum or plasma
Preferred Volume:
1 mL
Minimum Volume:
0.5 mL
Collection Procedure:
1. Separate the serum or plasma from the cells within 2 hours of collection.
2. Indicate serum or plasma on the request form.
3. Label the specimen appropriately (serum or plasma).
Store and Transport:
Refrigerated
Stability:
Refrigerated - up to 2 days
Room temperature - up to 24 hours
Frozen - up to 5 months
CPT Codes:
80185 - Phenytoin (EAP 30044930)
Test Schedule:
Monday through Sunday
Reference Ranges:
Therapeutic concentration:
10.0 - 20.0
μg/mL
Critical value:
> 30.0
μg/mL