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:Biochromatic rate
CPT Codes: 84436 x1
Turnaround Time:Performed and reported 24 hours/day.

Collection Instructions

Optimal Volume:2.5 mL
Minimum\Peds Volume:0.6 mL
Container:Red or gold (gel), St Joseph - Green (lithium heparin, no gel)
Alternate Containers: Green (lithium heparin, gel), Red (no gel), St. Joseph - Red (no 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:Stability: Room temperature or refrigerated temperature - 7 days; frozen - 30 days.
Test Performed at or Referral Lab Chemistry  (UMMC-East Bank, Grand Itasca, St. Joseph's)


Critical Range:GICH only: Less than 2.0 or greater than 20 ug/dL
Reference Range:
Age ug/dL
0-2 days 8.2-19.9
3-13 days 6.0-15.9
14-30 days 6.1-14.9
1 mo-2 years 6.8-13.5
3-9 years 5.5-12.8
10 years and older 4.5-13.9
GICH: All ages 6.1-12.2 ug/dL
Use:Occasionally helpful to evaluate suspected alterations in thyroid binding proteins.

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