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HelpTest ID BLOD0030 Phenytoin, Free, Serum
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
Specimen Type
Serum RedSpecimen Required
Collection Container/Tube: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 2 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial within 2 hours of collection.
Reject Due To
| Gross hemolysis | Reject |
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum Red | Refrigerated (preferred) | 7 days | |
| Frozen | 14 days | ||
| Ambient | 7 days |
Day(s) Performed
Monday through SundayReport Available
Same day/1 dayMethod Name
Membrane Separation/Kinetic Interaction Microparticles in Solution (KIMS)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80186
Reporting Name
Phenytoin, Free, SReference Values
Therapeutic: 1.0-2.0 mcg/mL Critical value: ≥2.5 mcg/mLTest Classification
This test has been cleared, approved, or is exempt by the US 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.Forms
If not ordering electronically, complete, print, and send a Therapeutics Test Request (T831) with the specimen.
Sanford Laboratories - Sioux Falls/Rapid City Additional Information:
SANFORD INTERFACE BUILD INFORMATION
| Result Code | Result Code Description |
|---|---|
| 1325 | Dilantin Free |