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HelpTest Code PNYA Phenytoin, Total, Serum
Useful For
Monitoring for appropriate therapeutic concentration
Assessing compliance or toxicity
Method Name
Kinetic Interaction of Microparticles in a Solution (KIMS)
Reporting Name
Phenytoin, Total, SSpecimen Type
Serum RedSpecimen Required
Collection Container/Tube: Red top
Submission Container/Tube: Plastic vial
Specimen Volume: 0.5 mL
Collection Instructions: Centrifuge and aliquot serum into a plastic vial within 2 hours of collection.
Specimen Minimum Volume
0.25 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Serum Red | Refrigerated (preferred) | 7 days | |
| Frozen | 14 days | ||
| Ambient | 7 days |
Reference Values
Therapeutic: 10.0-20.0 mcg/mL
Critical value: ≥30.0 mcg/mL
Day(s) Performed
Monday through Sunday
Report Available
Same day/1 dayPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test 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.LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| PNYA | Phenytoin, Total, S | 3968-5 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| PNYA | Phenytoin, Total, S | 3968-5 |
CPT Code Information
80185
Forms
If not ordering electronically, complete, print, and send 1 of the following forms with the specimen:
-Neurology Specialty Testing Client Test Request (T732)
-Therapeutics Test Request (T831)