T4, free-251

Test info

  
T4, free
  
251
  
84439.0
  
FT4
  
Free thyroxine
FT4

Specimen

  
Lithium heparin (Li hep) plasma
  
  
1.0 mL
  
0.2 mL
  

Immediately follow collection, mix sample by inverting 8 - 10 times to prevent clotting

  

Spin within two (2) hours of sample collection

  

Lt green plasma separator (PST)

 

  
Serum
  
  

Immediatley following collection, mix sample by inverting 5 times

  

Gold:

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

Red:

  1. Allow sample to clot
  2. Spin
  3. Transfer serum to a False bottom plasma/serum transport vial/tube (AHL), labelled as serum, within two (2) hours of sample collection
  

Gold serum separator (SST) tube

False bottom plasma/serum transport vial/tube (AHL)

  

Refrigerated (preferred) - 7 days

Ambient - 5 days

Frozen - 30 days

 

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

Performance

  
AHL - Chemistry: C
  
Daily
  
1 day
  

Electrochemiluminescence immunoassay (ECLIA)

Clinical and Interpretive info

  

0.93 - 1.70 ng/dL

Billing

  
84439
  
Yes
  

Tracking

  
11/30/2001
  
01/01/2023
  
01/04/2024