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Phenytoin, Total, Plasma or Serum
Test Code906
CPT Codes
80185
Preferred Specimen
Submit only 1 of the following specimens:
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma.
Collection Instructions: Random or trough level should be drawn 30 minutes before dose.
Note: 1. Dosage time and route of administration are required. 2. Indicate plasma and as random or trough. 3. Label specimen appropriately (plasma and as random or trough).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum.
Collection Instructions: Random or trough level should be drawn 30 minutes before dose.
Note: 1. Dosage time and route of administration are required. 2. Indicate serum and as random or trough. 3. Label specimen appropriately (serum and as random or trough).
Plasma
Container/Tube: Green-top (heparin) tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of plasma.
Collection Instructions: Random or trough level should be drawn 30 minutes before dose.
Note: 1. Dosage time and route of administration are required. 2. Indicate plasma and as random or trough. 3. Label specimen appropriately (plasma and as random or trough).
Serum
Container/Tube: Serum gel tube(s)
Specimen Volume: 3 mL (minimum volume: 0.5 mL) of serum.
Collection Instructions: Random or trough level should be drawn 30 minutes before dose.
Note: 1. Dosage time and route of administration are required. 2. Indicate serum and as random or trough. 3. Label specimen appropriately (serum and as random or trough).
Minimum Volume
Pediatric volume: 0.3 mL
Transport Temperature
Refrigerate
Methodology
Particle Enhanced Turbidimetric Inhibition Immunoassay
Setup Schedule
Monday through Sunday
Reference Range
Therapeutic concentration: 10.0-20.0 µg/mL
Toxic concentration (automatic call-back): >=20.1 µg/mL
Toxic concentration (automatic call-back): >=20.1 µg/mL
Clinical Significance
Useful for therapeutic drug monitoring.
Performed By
CoxHealth
