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Test Code T4 T4 (Thyroxine), Total

Additional Codes

Hospital Ordering Code
LAB126   Thyroxine, Total (T4) 

Specimen Requirements

Container/Tube Type: 

Green (Lithium Heparin)
Lime Green (Heparin Plasma Separator Tube)
Red (No Additive)
SST (Serum Separator)

 

Preferred Collection Container: 

Green (Lithium Heparin)
Light Green (Heparin Plasma Separator Tube)

 

Also Acceptable Collection Container: 

Plasma from Lavender tubes is acceptable but will not route in the Laboratory Information System (Sunquest).

 

Transport Information: 

1.5 mL blood/0.5 mL serum

 

Minimum Sample Volume: 

0.8 mL blood/0.13 mL serum

Performing Laboratory

Pathology Laboratory, UnityPoint Health, Des Moines

CPT

84436

Methodology

Electrochemiluminescence

Specimen Transport Temperature

Refrigerated Stability: 

7 days

 

Frozen Stability: 

1 month

 

Ambient Stability: 

2 hours

Day(s) Test Set Up

Performed: 

Daily

 

Analytical Time: 

1 day