|
Hormone levels |
Iodine uptake |
Clinical features | |
|
Phase 1 |
↑ FT4, ↑ FT3, ↓ TSH |
Low |
Thyrotoxicosis |
|
Phase 2 |
Normal |
Low |
Euthyroidism |
|
Phase 3 |
↓ FT4, ↓ FT3, ↑ TSH |
High |
Hypothyroidism |
|
Phase 4 |
Normal |
Normal |
Euthyroidism |
|
↑, increase; ↓, decrease; FT3, free triiodothyronine; FT4, free thyroxine; TSH, thyroid-stimulating hormone. | |||