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T4

Formal name: thyroxine
Alternative FT4, Free Thyroxine
Related tests: TSH, T3, FT4, FT3
At A Glance
 
Why get tested?
To diagnose hypothyroidism or hyperthyroidism in adults

When to get tested?
It has largely been replaced by measurement of FT4 but may still be is measured in response to an abnormal TSH test result

Sample required?
A blood sample taken from a vein in the arm



This page was last modified on May 10, 2008
 

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