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Laboratory Test Directory

Phenytoin, unbound

Components

Name Method Department Units
Unbound Phenytoin Ultrafiltration and chemiluminescence
Core Lab, Endocrinology ug/mL

Battery Members

Total phenytoin, free phenytoin

Specimen Requirements

Serum Spun, Plasma Spun

Container Type Container Size Specimen Volume
Preferred

Red tube, (no anticoagulant), No Gel

3 mL 3 mL
Alternate

Green tube (Sodium heparin), No Gel

3 mL 3 mL
Alternate

Green tube (Lithium heparin), No Gel

3 mL 3 mL
Stability

Refrigerated - 24 hour(s)
Frozen - 2 month(s)

Specimen Preparation

  • Mix heparin tube by gentle inversion immediately after collection
  • Centrifuge, remove plasma/serum and refrigerate

Reasons for Rejection

  • Collected in tube with gel separator
  • Gross hemolysis
  • Gross icterus
  • Gross lipemia
  • Capillary specimen
  • Frozen whole blood
  • Wrong collection tube
  • Wrong type of specimen

Comments

Note exact time of collection. This test also includes a total phenytoin.

CPT Code

  • 80185
  • 80186