Endocrine Abstracts

Fifty postmenopausal hypothyroid women (age 71.7±5.1 year) had been under replacement L-T4 therapy for 4.4±2.0 years before adding calcium carbonate (CC) (taken 1–2 h after L-T4). CC and tablet L-T4 were taken for the subsequent 2.3±1.1 years. Because serum TSH increased compared to L-T4 taken alone (3.33±1.0 vs 2.0±0.5 mU/l (baseline), P<0.001), with 9/50 having TSH values >4.12 mU/l, we instructed all 50 women to postpone CC aft...