The effect of anti-thyroid antibodies on endometrial volume, embryo grade and IVF outcome

Thyroid auto-immunity (TAI) has been implicated as the most common cause of hypothyroidism in general population, especially in women. Many studies revealed that increased infertility incidences with TAI. The aim of the present article was to evaluate the effect of thyroid auto-antibody (TAA) positivity on embryological parameters, IVF-outcome and endometrial volume (EnV) in infertile patients who were applied for routine artificial reproductive technologies (ART) programme. This study included prospective, sequential, cross-sectional analyses of parameters obtained from 69 patients with unexplained infertility. It was the first ART application of patients. Patients were homogenous for age, body mass index, basal hormone measurements and underwent same ovulation induction protocol. They were evaluated for thyroid hormone profile and TAAs and divided into three groups; TAA negative group (n=31), TAA positive group (n=23) and TAA positive and euthyroid with medication group (n=15). There were no differences among groups for the number of Grade-1 and Grade-2 embryos, distribution of embryo-grades, number of oocytes retrieved and fertilised, biochemical pregnancy ratios (PR), EnV and miscarriage ratio. However, the clinical PR was significantly lower in the TAA positive group (p=0.024). In conclusion, the embryo grades and EnV did not differ among groups. But the clinical PR differs and the anti-thyroid peroxides positivity, above the cut-off point, affects the clinical PR.