Table 1.

Laboratory results upon diagnosis

	Twin A	Twin B
	April 2008	January 2012
TSH [0.25-4.0 mU/l]	< 0.003 *	< 0.004 *
fT4 [6.8-18 pmol/l]	72 *	190.3 *
fT3 [3.2-6.0 pmol/l]	7.8 *	6.5 *
TSH receptor antibodies [< 1.8 IU/l]	3.313 *	9.7 *
Thyroid Peroxidase Antibodies (TPOAb) [<60 U/ml]	570.9 *	4,944 *
Thyroglobulin Antibodies [<30 U/ml]	45.0 *	141.1 *

TSH: thyroid stimulating hormone, fT₃: triiodothyronine, fT₄: thyroxine. * = out of range.