iarjmsIARJMSIARJMS2708-359410.47310/iarjms.2021.v02i02.002Serum Vitamin D among Infertile Men at Basrah Fertility Center and Possible etiological factorsAliFalihAl-AssadiSadiqKasimJassimHudaAbbasDhamiaSalihWarkaaMaridDepartment of obstetrics and gynecology, College of medicine, University of Basrah, Basrah, IraqObjective: Is to evaluate Serum Vitamin D among subfertile men at Basra maternity and children hospital and to evaluate the possible etiology. Aim: Is to explore the association of serum vitamin D levels with semen parameters and fertility status among males living at Basra city. Method: A prospective case control study was conducted on a randomly selected 120 infertile male (case group) compared with 120 fertile male that had a child within 1 year from the study time (control group). The study was conducted at Basra fertility center and outpatient department at Basra Maternity hospital during the period from (30th September 2019-30th June 2020). Both groups were investigated through detailed questionnaire and serum level of vitamin D was assessed. Among infertile men, semen samples were analyzed by the same person using the same technique on two occasions one week apart. Serum vitamin D level was measured in both groups using ELISA test. The vitamin 25(OH) D reference ranges that used in this study were as follows: sufficient > 30 ng/mL, insufficient 20-30 ng/mL and deficiency < 20 ng/dL. Result: The total number of cases was 120, and control was 120.There were a significant relation between serum vitamin D level and subfertility, as lower levels of 25OHD reported among subfertile males who had abnormal semen analysis.The current study revealed that the mean ± SD of serum 25 (OH) D level among cases group was (21.02±8.7) which was significantly lower than its level among fertile male. Most of the (48.3%) cases had deficient serum 25 (OH) D level in comparison to (26.7%) of the control group. This releation was statistically significant using  X2= 29.940, df= 1, P <0.05 S. Conclusions: There were a significant relation between serum vitamin D level and infertility, as lower levels of 25OHD reported among infertile males who had abnormal semen analysis.