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Test Code MISCLM Phenytoin, Free, Serum

Additional Codes

 

MAYO Test ID

PNYF

EPIC Test ID

2608

 

Useful For

Monitoring for appropriate therapeutic concentration of free phenytoin: free phenytoin level is the best indicator of adequate therapy in renal failure

 

Assessing compliance and toxicity

Method Name

Membrane Separation/Kinetic interaction microparticles in solution (KIMS)

Reporting Name

Phenytoin, Free, S

Specimen Type

Serum Red


Specimen Required


Container/Tube: Red top

Specimen Volume: 2 mL

Collection Instructions: Red-top tubes should be centrifuged and aliquoted within 2 hours of collection.


Specimen Minimum Volume

1 mL

Specimen Stability Information

Specimen Type Temperature Time
Serum Red Refrigerated (preferred) 7 days
  Frozen  14 days
  Ambient  7 days

Reject Due To

Hemolysis

Mild OK; Gross reject

Lipemia

NA

Icterus

NA

Other

Serum gel tube

Reference Values

Therapeutic: 1.0-2.0 mcg/mL Critical value: ≥2.5 mcg/mL

Day(s) and Time(s) Performed

Monday through Sunday; Continuously

Analytic Time

Same day/1 day

Performing Laboratory

Mayo Medical Laboratories in Rochester

Test Classification

This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.

LOINC Code Information

Test ID Test Order Name Order LOINC Value
PNYF Phenytoin, Free, S In Process

 

Result ID Test Result Name Result LOINC Value
PNYF Phenytoin, Free, S 3969-3

CPT Code Information

80186