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Background study of chemerin level in polycystic ovarian syndrome (PCO) patients and its relation to insulin resistance (IR). Upon chemerin on adipose tissue and glucose metabolism, serum chemerin has been recently studied in (PCO) women Aim We aimed to study the level of serum chemerin in PCO patients and its relation to insulin resistance. Methods The current study included 45 subjects with PCO syndrome and 45 healthy subjects as a control group. PCO subjects were divided into 27 obese PCO and 18 lean PCO. Control women were divided into 25 obese women and 20 lean women. Measurement of serum chemerin levels, fasting blood glucose (FBG),fasting insulin (FIN), total testosterone and pelvic ultrasonography Results Serum chemerin was significantly higher in the obese PCOS group (99.65 ± 13.72 ng/mL) compared with lean PCOS (87.99 ± 5,64 ng/mL) and the obese (76.82 ± 2.39 ng/mL) and non-obese (69.19 ± 8.40 ng/mL) control groups. In PCOS women, serum chemerin levels were positively correlated with Body mass index (BMI) (r = 0.835, P < 0.001), Fasting blood glucose (FBG) (r = 0.493, P < 0.005), Fasting insulin (FIN) (r = 0.913, P < 0.001), Homeostasis model assessment of insulin resistance (HOMA-IR) (r = 0.9181, P < 0.001). Conclusion There is an increase in serum chemerin level in PCOS patients with even more significant increase in patients with obese PCOS.