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Sample Collection

Preferences for Sample Collection, Serum or Plasma

 

Test

Serum
(red top)

EDTA Plasma
(purple top)

Comments

T4 Yes Yes Avoid Glass ?
T3 Yes No Lipemia Interferes
Cortisol Yes Yes, preferred Ship cold
(if serum)
Free T4 Yes No  
TSH Yes No  
Insulin Yes No No hemoysis
Ship cold
Endogenous ACTH No Yes Needs trasylol (aprotinin)
No hemolysis
Ship cold
Generally, avoid heparin

 

 

 
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