Children's Mercy Hospitals and Clinics
Name
T4, Total

Synonyms
Thyroxine

CMH Lab Section
Chemistry

Specimen Requirements
1 mL blood in a red top w/ yellow ring gel tube

Availability
Routine

Turn Around Time
2-4 hours

Methodology
Vitros

Ranges
Age Dependent:
0-4 days: 11.0-21.5 ug/dL
4 days-3wks: 8.0-19.0
3 wks-2mos: 7.0-16.0
2 mos-1yr: 5.0-14.0
1-15yrs: 5.0-13.0
> 15yrs: 5.0-12.0

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