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Phenytoin, Free, Plasma or Serum
Test CodeFRPTN
CPT Codes
80186
Preferred Specimen
Submit only 1 of the following specimens: Plasma
Draw blood in a blue-top (sodium citrate) tube, a green-top (lithium heparin) tube, or a lavender-top (EDTA) tube. Spin specimen down and send 0.5 mL of plasma.
Note: 1. Indicate plasma.
2. Label specimen appropriately (plasma).
Serum
Draw blood in a plain, red-top tube. SST tube is acceptable. Spin specimen down and send 0.5 mL of serum.
Note: 1. Indicate serum.
2. Label specimen appropriately (serum).
Draw blood in a blue-top (sodium citrate) tube, a green-top (lithium heparin) tube, or a lavender-top (EDTA) tube. Spin specimen down and send 0.5 mL of plasma.
Note: 1. Indicate plasma.
2. Label specimen appropriately (plasma).
Serum
Draw blood in a plain, red-top tube. SST tube is acceptable. Spin specimen down and send 0.5 mL of serum.
Note: 1. Indicate serum.
2. Label specimen appropriately (serum).
Transport Temperature
Ambient
Methodology
Enzyme-Multiplied Immunoassay Technique (EMIT)
Note: Refer to Therapeutic Drug Monitoring (TDM) Recommended Collection Times for Peak/Trough Levels located in General Information.
Setup Schedule
Monday through Sunday
Reference Range
<3.0 µg/mL
Critical value: >3.0 µg/mL
Performed By
North Mississippi Medical Center Pathology Department
Performing Laboratory
NMMC Pathology Department
