Table 1.

Thyroid parameters of the neonate and the mother

	Neonate				Mother
Days after birth	4	10	13	14	10
Biotin supplementation	yes	yes	no	no	no
TSH, mU/l	0.10	0.04	4.3	2.5	1.4
T3, nM	>10	>10	2.5	2.3	1. 9
T4, nM	304	242	117	130	143
TRAb, IU/l	–	–	negative	–	negative

TSH, T3 and T4 were measured in the neonate 4, 10, 13 and 14 and in the mother 10 days after birth. TRAb was only measured once in both the neonate and the mother. The mother stopped biotin intake immediately after the delivery and the neonate 12 days after birth. The TRAb assay used in the present study was not biotinylated.