Large glycoprotein synthesised exclusively by thyroid follicular cells. Used as a tumour marker for monitoring differentiated thyroid cancer after thyroidectomy. Undetectable on thyroxine suppression indicates remission.
| Sex | Age | Range | Notes |
|---|---|---|---|
| All | ≥ 18 yrs | 1.4 – 78 | Euthyroid adults with intact thyroid; post-thyroidectomy: undetectable (<0.1) is target |
⚠ Clinical Note
Reference ranges are indicative. Always interpret results in the context of the individual patient and local laboratory reference intervals, which may vary.