TPO and autoimmune thyroid disease: In our study, we took into account the recommendations of different authors [4,26,27] regarding the exclusion of women with thyroid autoimmunity (TPO Ab > 35 U/mL) because of their association with increased concentrations of TSH, observing a slight change in the reference values that went from 0.127–4.471 mIU/L to 0.128–4.455 mIU/L.