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Rugge JB, Bougatsos C, Chou R. Screening for and Treatment of Thyroid Dysfunction: An Evidence Review for the U.S. Preventive Services Task Force [Internet]. Rockville (MD): Agency for Healthcare Research and Quality (US); 2014 Oct. (Evidence Syntheses, No. 118.)
Screening for and Treatment of Thyroid Dysfunction: An Evidence Review for the U.S. Preventive Services Task Force [Internet].
Show detailsTable 1Classification of Thyroid Dysfunction: Biochemical Definition
| Condition | TSH Level | Thyroid Hormones | Comments |
|---|---|---|---|
| Overt hyperthyroidism | <0.1 mIU/L or undetectable | Elevated T4 or T3 | |
| Overt hypothyroidism | >4.5 mIU/L | Low T4 | |
| Subclinical hyperthyroidism | <0.1 mIU/L | Normal T4 and T3 | Clearly low serum TSH |
| 0.1 to 0.4 mIU/L | Normal T4 and T3 | Low but detectable | |
| Subclinical hypothyroidism | 4.5 to 10 mIU/L | Normal T4 | Mildly elevated TSH |
| ≥10 mIU/L | Normal T4 | Markedly elevated TSH | |
- Table 1, Classification of Thyroid Dysfunction: Biochemical Definition - Screeni...Table 1, Classification of Thyroid Dysfunction: Biochemical Definition - Screening for and Treatment of Thyroid Dysfunction
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