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. Indicate serum or plasma on the request form.
2. Label the specimen appropriately (serum or plasma).
Store and Transport:
Room Temperature: < 12 hours
Refrigerated: > 12 hours
Refrigerated: > 12 hours
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