T4, free

Alphabetical Test listing

T4, free-251

  
T4, free
  
251
  
84439.0
  
FT4
  
Free thyroxine
  
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

  

Lt green plasma separator (PST)

 

  
Serum
  

Gold serum separator (SST) tube

Red serum vial/tube, 5 mL

Red serum vial/tube, 10 mL

Red/Grey marble top serum separator (SST) vial/tube, 8.5 mL

  

Gold or Red/Grey marble top:

Immediatley following collection, mix sample by inverting 5 times

  

Gold or Red/Grey marble top:

  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

Red/Grey marble top serum separator (SST) tube

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

  

Refrigerated (preferred) - 6 days*

Frozen - 30 days

*Allina Health Laboratory stability studies have shown this analyte to be stable up to 5 days when stored refrigerated in gel tubes.

  
  • Improper labels (unlabeled or mislabeled)
  • Hemolysis (some procedures)
  • Improper anticoagulant or ratio
  • Delay in transport
  • Improper storage temperature affecting results
  • Improper container
  • Leaking container resulting in compromised specimen
  • Quantity not sufficient (QNS)
  
AHL - Chemistry: C
  
Daily
  
1 day
  

Chemiluminescent Microparticle Immunoassay (CMIA) and Chemiflex

  

0.70 - 1.80 ng/dL

  
84439
  
Yes
  
  
11/30/2001
  
09/11/2018
  
02/17/2020