Lab Note:Reference ranges vary significantly between laboratories. Always interpret in context of local lab normative data and patient's clinical symptoms.
Verified
Last Review: 2026
| TSH | Free T4 | Interpretation |
|---|---|---|
| High | Low | Primary Hypothyroidism |
| High | Normal | Subclinical Hypothyroidism |
| Low | High | Primary Hyperthyroidism |
| Low | Normal | Subclinical Hyperthyroidism |
| Normal | Low | Central Hypo or Sick Euthyroid |
| Normal/High | High | Thyroid Hormone Resistance/TSHoma |
Garber JR et al. • Endocr Pract. 2012;Comprehensive guide on interpreting thyroid function tests and treatment thresholds.
Ross DS et al. • Thyroid. 2016;The definitive staging and management source for thyrotoxic states.
Last Comprehensive Review: 2026
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