PHENYTOIN (DILANTIN)

Test Code: 139Specimen Collection: Plasma from a Lavender or Lithium Heparin
Component:

Phenytoin

Method:

IA

Collection Notes: Collect as a trough just before the next dose. Plasma should be physically separated from cells as soon as possible with a maximum limit of 2 hours from the time of collection. Centrifuge and physically separate the plasma using a plastic transfer pipette into a separate plastic transfer tube.
Clinical Utility: Phenytoin is used for the treatment of grand mal and complex partial seizures. Phenytoin levels are monitored to assure adequate therapeutic levels are achieved and to avoid toxicity.
CPT Code: 80185Testing Location: Sent to reference lab
SPECIMEN/STABILITY TYPE
Temperature:

Plasma (1 mL), EDTA

Ambient
 
5
 
Days
Refrigerated
 
10
 
Days
Frozen
 
30
 
Days

Plasma (1 mL), Lithium Heparin

Ambient
 
5
 
Days
Refrigerated
 
10
 
Days
Frozen
 
30
 
Days
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