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
Reference:
- Dayan CM. Interpretation of thyroid function tests. Lancet 2001;357:619-24.
- Thyroid Function Tests. British Thyroid Foundation, revised 2021
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