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Test Code DLTN Dilantin® (Phenytoin), Plasma or Serum


Turbidometric Immunoassay

Performing Laboratory

Aspen Valley Hospital

Specimen Requirements

Submit only 1 of the following specimens:




Container/Tube:  Green-top (lithium heparin) tube(s)

Specimen:  2 mL (minimum volume:  0.5 mL) of lithium heparin plasma

Transport Temperature:  Ambient

Collection Instructions:  Spin down immediately and send entire tube to laboratory. If there is a delay in transport of >8 hours, send specimen refrigerated ≤7 days.

Note:  1. Indicate plasma on request form.
2. Label specimen appropriately (plasma).

Reference Values

Therapeutic range:  10.0-20.0 µg/mL

Critical value (automatic call-back):  >30.0 µg/mL

Day(s) Test Set Up

Monday through Sunday

Test Classification and CPT Coding