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Thyroid disease categorization.
| Disease condition | TSH | FT4 |
|---|---|---|
| Hypothyroidism | ||
| Subclinical hypothyroidism | >4.2 mIU/L | 0.9–1.7 ng/dL |
| Overt hypothyroidism | >4.2 mIU/L | <0.9 ng/dL |
| Hyperthyroidism | ||
| Subclinical hyperthyroidism | <0.3 mIU/L | 0.9–1.7 ng/dL |
| Overt hyperthyroidism | <0.3 mIU/L | >1.7 ng/dL |
