T4, Total

Abbrev Code:T4   
Order Code:LAB126Order Name:Thyroxine Total
Order Instructions:Test performed by special request only; otherwise a Free T4 will be substituted.
Synonyms:Thyroxine, Total
Methodology:Electrochemiluminescence immunoassay (ECLIA)
CPT Codes: 84436 x1, 84436 x1
Turnaround Time:Performed and reported 24 hours/day.

Collection Instructions

Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Green (lithium heparin, gel)
Alternate Containers: Green (lithium heparin, no gel), Red (no gel), Red (gel)

Processing and Shipping

Specimen Processing:Centrifuge and aliquot 1.25 mL, 0.2 mL minimum. Store in refrigerator.
Shipping Instructions:Ship at refrigerated temperature.
Stability:4 days at room temperature; 8 days refrigerated; 1 year frozen. Freeze only once.
Test Performed at or Referral Lab Chemistry  (Roche-UMMC East)


Reference Range:
Age ug/dL
0-5 d 5.0-18.5
6 d - 2 mo 5.4-17.0
3-12 mo 5.7-16.0
1-5 y 6.0-14.7
6-10 y 6.0-13.8
11-19 y 5.9-13.2
20 y & older  
        Hypothyroid <4.5
        Euthyroid 4.5-11.7
        Hyperthyroid ?11.7
Use:Occasionally helpful to evaluate suspected alterations in thyroid binding proteins.

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