What is Thyroxine (T4)?
Thyroxine is measured as part of a thyroid panel. Your T4 is normal.
What does a high Thyroxine mean?
Elevated T4 with low TSH suggests hyperthyroidism.
What does a low Thyroxine mean?
Low T4, especially with high TSH, confirms hypothyroidism. Your thyroid isn't producing enough hormone.
Understand your whole report, not just one number
A single value rarely tells the full story — Thyroxine is best read alongside the rest of your panel. Paste your values or upload your report and get a plain-English explanation of every marker, with the important results flagged.