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Mayo Clinic Laboratories

Test Code DILANT Phenytoin (Dilantin®), Total, Serum or Plasma

Methodology

Immunoassay

Specimen Requirements

Container/Tube:

Preferred: Lithium heparin (light green-top)

Acceptable: Serum Gel

 Draw blood, spin down and send 1 mL (pediatric:  0.2 mL) of plasma or serum.

Reject Due To

 

Hemolysis

Mild:

ok

Gross:

ok

Lipemia

Mild:

ok

Gross:

ok

Icterus

Mild:

ok

Gross:

ok

 

Reference Values

Therapeutic concentration:  10.0-20.0 µg/mL
Critical value:  >30.0 µg/mL

Day(s) Test Set Up

Monday through Sunday

CPT Coding

80185

Performing Laboratory

Huntsville Hospital Laboratory/Madison Hospital Laboratory

LOINC Coding

Test Name LOINC Code

Phenytoin (Dilantin®), Total, Serum or Plasma

 3968-5

 

Specimen Stability Information

 

Specimen Type

Temperature

Time

Plasma,lithium heparin / Serum

RT, spun

4 days
  Refrigerated, spun 4 days

 

Secondary ID

HHA1603