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The Polycystic ovarian syndrome is a feature of the various menstrual cycles, infertility, hormonal irregularities, and hyperandrogenism. Insulin resistance, lipedema and hyperandrogenism are the most widespread endocrine disorder in PCOS. Most half of women with PCOS suffer from hirsutism, weight gain, metabolic syndrome, insulin resistance, hypothyroidism, and dyslipidemia. The Aim of the Study is to measure thyroid function, especially hypothyroidism in women with the polycystic ovarian syndrome and its association with insulin resistance. It also aims to estimate the effect of hypothyroidism on the level of each of the following biochemical parameters: lipid profile, glucose, insulin, anti mullerain hormones, sex hormone and thyroid disorders frequency (hypothyroidism) in PCOS. Subjects, Materials and Methods: This study was performed on patients in the outpatient clinics of the Obstetrics, Gynecology and Infertility Clinic and at the al-Yarmouk Teaching Hospital in 2020, and it included 30 (control group) and 70 patients, including 35 euthyroid PCOS and 35 hypothyroidism PCOS (PCOS group), in the age group 15-45 years. Thyroid hormone levels Thyroxine (FT3, FT4) and Thyroid Stimulating Hormone (TSH), Luteinizing Hormone (LH), Follicle Stimulating Hormone (FSH), Prolactin (PRL), Testosterone, Progestogen, Estradiol (E2), Anti Mullerian Hormones (AMH), Thyroperoxidase Anti Bodies (anti TPO), Insulin were measured by using a device cobas e411, and Lipid profile and Glucose by using a device cobas c311. Results: There was an increase in TSH levels, a decrease in thyroxine, an increase in lipid profile levels, an increase in the sex hormones levels, increase glucose and insulin resistance which is a sign of diabetes type 2. However, the reverse is noticed in the relation of hypothyroidism on PCOS with weight gain, lipids, insulin resistance, androgynism and hirsutism. The most frequent thyroid disorders affecting PCOS in this study were found to be autoimmune thyroiditis and hypothyroidism. Conclusions: More than half of the women with PCOS suffer from hypothyroidism, compared to the normal women. As it was observed that dyslipidemia, weight gain, hirsutism, insulin resistance and sex hormones were more in hypothyroidism PCOS women compared to normal control subjects. We also concluded that PCOS and hypothyroidism are interrelated, as the presence of either is a cause of the other and that means the PCOS is more than just oligomenorrhea, amenorrhea, or infertility.

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