TPO and autoimmune thyroid disease: The TABLET study results, along with those of the recently published Pregnancy Outcomes Study in Euthyroid Women With Thyroid Autoimmunity after Levothyroxine (POSTAL) study [8], an RCT that showed no effect of levothyroxine on pregnancy outcomes in euthyroid TPO Ab-positive women undergoing in vitro fertilization treatment, raise intriguing questions on thyroid antibody positivity and pregnancy loss.