Introduction: The morbid obesity (BMI greater than or equal to 40 kg/m2) is associated with dysfunction of the hypothalamus-pituitary-thyroid axis, showing high levels of thyrotropin (TSH), triiodothyronine (T3) total and free, suspecting a real thyroid condition. Our objetive was to describe the alterations in thyroid function in patients with morbid obesity, determining serum levels of TSH, total T3, free T4 and thyroid peroxidase antibodies (TPO).
Methods: Prospective, descriptive, observational, cross-sectional study, we enrolled 52 patients with morbid obesity, at the obesity clinic, from department of Endocrinology, since January 2009 to July 2011.