Table.
Serum thyroid function tests and iodine levels in maternal iodine-induced CH
| Age | Free T4, μ/dL | TSH, mIU/L | L-T4 treatment | Urine iodine, μg/L | Breast milk iodine, μg/L | |
|---|---|---|---|---|---|---|
| Normal range | 2-20 wk | 0.9-2.3 (11.6-29.6) | 1.7-9.1 | 42-350 | 5-180 | |
| Case 1 | 25 d | 0.47 (6.1) | >100 | 0→ μg/d | ||
| 29 d | 3228 | |||||
| 33 d | 70 | |||||
| Case 2 | 8d | 0.5 (6.4) | 419.5 | 0→25 μg/d | ||
| 12d | 10 474 | |||||
| 3 wk | 3.21 (41.3) | 3.53 | 25 μ/d→d/c | |||
| 5 wk | 1.84 (23.7) | 7.31 | 0 | 609 | ||
| 7 wk | 1.72 (22.1) | 7.48 | 0 | |||
| Case 3 | 8d | Quantity not sufficient | 217.13 | 0→25 μd | ||
| 3 wk | 2.29 (29.5) | 2.41 | 25 μ/d→d/c | |||
| 5 wk | 1.56 (20.1) | 5.34 | 0 | |||
| 7 wk | 1.35 (17.4) | 3.35 | 0 | 209 |
L-T4, levothyroxine; QNS, quantity not sufficient; d/c, discontinued.