Table 3 Biomarkers of iodine status

Cord blood

n = 19

n = 22

Free triiodothyronine, pmol/l^a

2.3 (0.4)

2.3 (0.6)

0.0 (−0.4, 0.3)

0.81

Free thyroxine, pmol/l^a

14.4 (2.1)

13.8 (2.3)

0.6 (−0.9, 2.2)

0.40

Thyroid-stimulating hormone, mIU/l^b

8.2 (5.9–13.5)

6.6 (4.5–9.6)

N/A

0.25

Thyroglobulin, μg/l^b

73.0 (48.0–100.0)

64.0 (44.0–121.0)

N/A

0.66

(n = 28)

(n = 29)

Newborn TSH, mIU/l^a

2.1 (1.0)

2.2 (1.2)

−0.1 (−0.7, 0.5)

0.79

Newborn TSH > 5^c

0 (0.0)

0 (0.0)

N/A

N/A

(n = 20)

(n = 25)

Breast milk iodine at 6 weeks’ post-partum, μg/l^b

106.0 (84.0–146.0)

124.0 (76.0–155.0)

N/A

0.74