Curated insights • How it Works • Practical Pearls • Evidence Base
| 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 |
Clinical practice guidelines for hypothyroidism in adults.
2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis.
Lab Note:Reference ranges vary significantly between laboratories. Always interpret in context of local lab normative data and patient's clinical symptoms.