Definitions of thyroid disease and thyroid dysfunction levels used in study
| Thyroid stimulating hormone (mIU/L) | Free thyroxine (pmol/L) | Total thyroxine (mmol/L) | |
|---|---|---|---|
| Thyroid dysfunction definitions | |||
| Euthyroidism | 0.2–5.0 | 9–22 | 60–140 |
| Overt hypothyroidism | >5.0 | <9 | <60 |
| Subclinical hypothyroidism | >5.0 | 9–22 | 60–140 |
| Overt hyperthyroidism | <0.2 | >22 | >140 |
| Subclinical hyperthyroidism | <0.2 | 9–22 | 60–140 |
| Thyroid stimulating hormone (TSH) level dependent thyroid dysfunction definitions | |||
| Euthyroidism | 0.4–5.0 | 9–22 | 60–140 |
| High normal euthyroidism | 0.2–0.4 | 9–22 | 60–140 |
| Subclinical hyperthyroidism (reduced TSH) | 0.1–0.2 | 9–22 | 60–140 |
| Subclinical hyperthyroidism (suppressed TSH) | <0.1 | 9–22 | 60–140 |