thyroid disease diagnostic algorithm
Where TSH and free T3 or T4 are measured as the first-line thyroid investigation there are six patterns of abnormality:
- TSH may be high or low
- free T3 or free T4 may be low, normal or high
- Dayan CM. Interpretation of thyroid function tests. Lancet 2001;357:619-24.
Last edited 04/2021 and last reviewed 06/2021