Initial investigations and treatment
| Age (y) | TSH (mU/l) (N = 0.4–4) | Total T4 (nmol/l) (N = 80–150) | Free T4 (pmol/l) (N = 10–25) | Free T4 on treatment | Duration of treatment | |
|---|---|---|---|---|---|---|
| N, normal; T4, thyroxine; TSH, thyroid stimulating hormone. | ||||||
| Case 1 | 8 | 2.5 | 248 | 31.5 | 62.4 | 2 y |
| Case 2 | 7 | 4.0 | 238 | 43.9 | 40.4 | 6 mth |
| Case 3 | 33 | 1.27 | 196 | 44.4 | 40.8 | 1 y 3 mth |