Test Code PTN Phenytoin (Dilantin), Total, Plasma or Serum
Methodology
Fluorescence Polarization Immunoassay (FPIA)
Performing Laboratory
Decatur Morgan Hospital-Decatur Campus/Parkway Campus
Specimen Requirements
Submit only 1 of the following specimens:
Plasma
Draw blood in a green-top (lithium heparin) tube(s). Spin down and
send 1 mL (pediatric: 0.2 mL) of lithium heparin plasma
refrigerated.
Note: 1. Indicate plasma on request
form.
2. Label specimen appropriately (plasma).
Serum
Draw blood in a plain, red-top tube(s) or a serum gel tube(s). Spin
down and send 1 mL (pediatric: 0.2 mL) of serum
refrigerated.
Note: 1. Indicate serum on request form.
2. Label specimen appropriately (serum).
Reference Values
Therapeutic concentration: 10.0-20.0 µg/mL
Critical value (automatic
call-back): ≥30.0 µg/mL
Test Classification and CPT Coding
80185