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A child diagnosed with congenital hypothyroidism after newborn screening and follow up thyroid function test at 1 month of life in another general hospital demonstrated euthyroid state with thyroxine(T4) supplementation until the age of 22 months of life, when he was transferred to our hospital, where he was diagnosed as thyroxine binding globulin(TBG) deficiency with low T4 and TBG. Withdrawal... |