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Thyroxine (T4) Free  

Additional Codes

LAB127

Performing Laboratory

MBMC Main Laboratory

Methodology

Electro-Chemiluminescent Immunoassay (ECLIA)

Specimen Requirements

Preferred Specimen Type: Plasma
Container/Tube: Mint-green top (lithium heparin gel)
Specimen Volume: Full tube

Alternative Specimen Type: Serum

Alternative Container/Tube: Gold, Serum gel

Alternative Specimen Volume: Full tube

Specimen Transport Temperature

Ambient

Day(s) Test Set Up

Monday through Sunday
Turnaround Time:
STAT: 1 hour after receipt in laboratory
Routine: within 4 hours

Reference Values

0-4 days:   1-3 ng/dL 

4-30 days:  0.8-2.2 ng/mL

>30 days:  0.9-1.7 ng/dL

Test Classification and CPT Coding

 

Test Classification:This test has been cleared or approved by the U.S. Food and Drug Administration and is used per manufacturer’s instructions.
CPT Code:
84439

 

Stability

5 days Refrigerated