Phenytoin-91

Test info

  
Phenytoin
  
91
  
80185.0
  
PTN
  
Cerebyx
Dilantin
DPH
Fosphenytoin
PHT
  

Fosphenytoin is ProDrug of Phenytoin and is measured as Phenytoin.

Specimen

  
Lithium heparin (Li hep) plasma
  
  
1.0 mL
  
0.2 mL
  
  • Specimen should be collected:
    • Peak (regular release): 1-3 hours post dose
    • Peak (slow release): 4-12 hours post dose
    • Trough: immediately prior to next dose
  • Immediately following collection, mix sample thoroughly by gently inverting 8 - 10 times to prevent clotting
  

Spin within two (2) hours of sample collection

  

Lt green plasma separator (PST)

  
Serum
  
  

Immediately following collection, thoroughly mix sample by gently inverting 5 times

  
  1. Allow sample to clot for a minimum of 30 minutes
  2. Spin within two (2) hours of sample collection
  

Gold serum separator (SST) tube

  

Refrigerated (preferred) - 7 days

Ambient - 2 days

Frozen - 5 months

  
  • Improper labels (unlabeled or mislabeled)
  • Hemolysis (some procedures)
  • Improper anticoagulant or ratio
  • Delay in transport
  • Improper storage temperature affecting results
  • Inappropriate timing of collection
  • Improper container
  • Leaking container resulting in compromised specimen
  • Quantity not sufficient (QNS)

Performance

  
AHL - Chemistry: C
  
Daily
  
1 day
  

Chemiluminescent Micro-particle Immunoassay (CMIA)

Clinical and Interpretive info

  

10.0 - 20.0 µg/mL

  

> 30.0 µg/mL

Billing

  
80185

Tracking

  
11/30/2001
  
02/12/2020
  
02/10/2020