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A 40 year old woman complains of tiredness over the past few weeks.She had a total thyroidectomy three years ago for Graves'thyrotoxicosis and has been taking levothyroxine since then.She weighs 80 kg and is taking 150 μg daily.A blood test done in the previous week showed thyroid stimulating hormone(TSH)levels above 30 mU/L(reference range 0.4-4.5 mU/L).