TG and Primary hypothyroidism: Abalovich M et al. reported that a higher TSH level prior to pregnancy is predictive of a requirement for increased LT4 dose during pregnancy in women with primary hypothyroidism, in whom serum TSH prior to pregnancy was < 2.5 μIU/ml [9], suggesting that serum TSH level might reflect the current status of thyroid hormone production even in women with euthyroid Hashimoto’s thyroiditis.