T4, FREE (FREE THYROXINE)

Test Code: 151Specimen Collection: Serum
Component:

T4, Free

Method:

IA

Collection Notes: Serum is the recommended sample type for this assay.
Clinical Utility: Free T4 is measured together with TSH when thyroid function disorders are suspected. The determination of fT4 is also suitable for monitoring thyrosuppressive therapy.
CPT Code: 84439Testing Location: AML
SPECIMEN/STABILITY TYPE
Temperature:

Serum (1 mL)

Ambient
 
8
 
Hours
Refrigerated
 
5
 
Days
Frozen
 
30
 
Days

EDTA plasma (1 mL)

Ambient
 
8
 
Hours
Refrigerated
 
5
 
Days
Frozen
 
30
 
Days

Heparinized plasma (1 mL)

Ambient
 
8
 
Hours
Refrigerated
 
5
 
Days
Frozen
 
30
 
Days
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