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HelpTest Code PNYF Phenytoin, Free, Serum
Specimen 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.
Children's Mercy Hospital
Note:
CMH COLLECTION: 3 mL in red vacutainer
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 |
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
Reject Due To
| Gross hemolysis | Reject |
Day(s) Performed
Monday through SundayReport Available
Same day/1 dayReporting Name
Phenytoin, Free, SReference Values
Therapeutic: 1.0-2.0 mcg/mL Critical value: ≥2.5 mcg/mLMethod Name
Membrane Separation/Kinetic Interaction Microparticles in Solution (KIMS)
Performing Laboratory
Mayo Clinic Laboratories in Rochester
CPT Code Information
80186