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HelpTest Code DIL PHENYTOIN (DILANTIN)
Methodology
Heterogenous Competitive Immunoassay
Phenytoin is an anticonvulsant that is used primarily in the treatment of seizure disorders. This test may be used to monitor for appropriate therapeutic concentration, or to assess compliance or toxicity.
Specimen Requirements
Submit only 1 of the following specimens:
Preferred:
Serum Gel Tube
Specimen Type: Serum
Container/Tube: Serum gel
Specimen Volume: 2 mL
Specimen Minimum Volume: 1 mL
Collection Instructions:
- Draw blood just prior to next dose or as specified by physician.
- To confirm toxicity, peak levels should be drawn 3 to 9 hours post oral dose.
- Spin down within 4 hours of draw.
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Additional Information:
1. Date and time of last dose and time of draw are required.
2. Label specimen as serum.
Alternate:
Plain Red Top Tube
Specimen Type: Serum
Container/Tube: Plain, red top
Specimen Volume: 2 mL
Specimen Minimum Volume: 1 mL
Collection Instructions: Draw blood just prior to next dose or as specified by physician. To confirm toxicity, peak levels should be drawn 3 to 9 hours post oral dose. Spin down within 4 hours of draw.
Additional Information:
1. Date and time of last dose and time of draw are required.
2. Label specimen as serum.
Specimen Type: Plasma
Container/Tube: Green top (lithium heparin)
Specimen Volume: 2 mL
Specimen Minimum Volume: 1 mL
Collection Instructions: Draw blood just prior to next dose or as specified by physician. To confirm toxicity, peak levels should be drawn 3 to 9 hours post oral dose. Spin down within 4 hours of draw.
Additional Information:
1. Date and time of last dose and time of draw are required.
2. Label specimen as plasma.
Day(s) Test Set Up
Monday through Sunday
Reference Values
Therapeutic concentration: 10.0-20.0 µg/mL
Critical concentration (automatic call-back): >25.0 µg/mL
Performing Laboratory
Logan Health Medical Center-Chemistry
Test Classification and CPT Coding
80185
Specimen Transport Temperature
Refrigerate