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. Author manuscript; available in PMC: 2011 May 1.

Published in final edited form as: Clin Endocrinol (Oxf). 2010 May;72(5):709–715. doi: 10.1111/j.1365-2265.2009.03700.x

24-hour profile of total T3 levels (panel A) and TSH (panel B) on ◆ lT-3 and (●) l-T4 thyroid hormone replacement therapy. Samples were obtained at 4-hour intervals, except for the second TSH time-point where the time 0 TRH stimulation test (08:00) was substituted for the 10:00 time-point to avoid the artifact of the TRH-stimulated rise in TSH.

24-hour profile of total T3 levels (panel A) and TSH (panel B) on ◆ lT-3 and (●) l-T4 thyroid hormone replacement therapy. Samples were obtained at 4-hour intervals, except for the second TSH time-point where the time 0 TRH stimulation test (08:00) was substituted for the 10:00 time-point to avoid the artifact of the TRH-stimulated rise in TSH.