Table 1.

Thyroid parameters measured at the indicated times in four patients who underwent bariatric surgery between 2009 and 2011. Patients were receiving oral l-T4 in either tablet or liquid form as indicated

	Before surgery l-T4 in tablet form				12 Months after surgery l-T4 in tablet form				14 Months after surgeryL-T4 in liquid form				17 Months after surgery l-T4 in tablet form
Patient	l-T4 (μg)	TSH	fT4	fT3	l-T4 (μg)	TSH	fT4	fT3	l-T4 (μg)	TSH	fT4	fT3	l-T4 (μg)	TSH	fT4	fT3
1	200	4.2	12.7	3.1	200	18.1	10.4	2.9	200	1.5	12.9	3.8	200	36.7	9.8	3.0
2	150	3.1	12.9	3.3	150	12.1	10.2	3.2	150	1.9	13.5	4.0	150	24.7	10.4	3.2
3	200	3.9	11.7	3.7	200	20.4	10.2	3.3	200	0.6	13.5	3.2	200	17.7	10.2	3.1
4	150	3.6	10.9	3.2	150	17.2	11.0	2.8	150	2.4	11.9	3.2	150	15.3	10.1	3.1

l -T4 levothyroxine, TSH thyrotropin, fT4 free tyroxine, fT3 free triiodothyronin