Introduction. Polycystic ovary syndrome (PCOS) is the most common endocrine disorder in women of reproductive age. There is some evidence suggested that vitamin D played a role in the incidence of PCOS. Previous research has found vitamin D deficiency in the pathogenesis of PCOS and cohort studies showing the relationship of obesity with decreased levels of 25-hydroxy vitamin D. Therefore, we aim to conduct a study on vitamin D levels in women with polycystic ovary syndrome. Objective. To determine the difference of the levels of vitamin D in women with and without polycystic ovary syndrome. Methods. This study is a comparative analytical study on two unpaired population by using cross-sectional study design. The study was conducted in Halim Fertility Clinic Medan starting in November 2014 through April 2015. Blood samples were taken from 23 women PCOS and 23 non-PCOS women. Further data were tabulated and analyzed. Results. Vitamin D levels are lower in women with PCOS compared to controls. In the PCOS group, the levels of vitamin D were lower in obese women. Vitamin D levels were also lower in PCOS women with WHR > 0.85. Conclusion. This study showed a significant lower level of vitamin D in PCOS patient.

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Estrogen receptors (ER) play an important role in mediating action. The ER α has a higher affinity for estrogen and the dominant form of the normal endometrium. A cross-sectional study from an ectopic  tissue of endo-metriosis and normal was examined for immunohistochemistry. This research was conducted from November 2015 until the sample complete. The analysis was performed using Fisher Exact test, p <0.05 was considered to any difference of estrogen alpha receptor expression between endometriosis patients with no endometriosis. REα is more dominant in normal endometrium, whereas in the case of endometriosis in the presence of many negative expression of REα then the assumption that REβ is a receptor that many encountered. There is a dif-ference in the expression of REα between endometriosis with no endometriosis.