Table 4.
Thyroid hormone status and thyroid function tests among children at follow-up a.
| Thyroid Hormones and Thyroid Function Tests | Children (n = 289) | Reference Range |
|---|---|---|
| TSH, mIU/L | 3.1 (0.2–15.3) | 0.70–6.0 |
| fT4, pmol/L | 16.3 (11.2–21.8) | 12.3–22.8 |
| fT3, pmol/L | 6.9 (3.9–17.2) | 3.7–8.5 |
| Tg, µg/L | 38.4 (10.7–158.0) | <67 |
| Subclinical hypothyroidism b | 27 [9.3] | |
| Subclinical hyperthyroidism | 1 [0.4] | |
| Overt hyperthyroidism | 1 [0.4] | |
| fT4 low <12 pmol/L, normal TSH c | 3 [1.0] | |
| fT3 elevated >8.5 pmol/L, normal TSH d | 8 [2.8] | |
| Tg elevated >67 µg/L, normal thyroid tests | 28 [9.7] | |
| Total thyroid disturbance and/or elevated Tg | 68 [23.5] |
a Data are presented as median/mean (min-max) and n [%]; b Among children with subclinical hypothyroidism there were 10 [37%] with elevated Tg, one had elevated fT3; c Among low fT4, one had elevated Tg; d Among children with elevated fT3, one had elevated Tg.