Aim: To investigate endocrinologic and endometrial factors in cases of recurrent abortions. Material and Method: In cases of recurrent abortions, clinical and ultrasonographic features, genetic, anatomic and immunologic factors, hormonal profiles and endometrial samplings were assessed. Chromosomal abnormalities and uterine anomalies were excluded. Results: In 8 (14%) of 57 cases with recurrent abortions, there were low progesterone levels. In 1 (1.75%) case there was a high androgen level. In 2 (3.5%) cases there was hyperprolactinemia and in another 2 (3.5%) cases there were high insulin levels. In 4 (7%) cases two scores of OGTT were high. In 51 cases where endometrial sampling was performed, only one (1.75%) case had delayed endometrial development. Discussion: We conclude that recurrent abortions have a complex etiology related to endocrinologic and endometrial factors.