Introduction: Infertility is defined as lack of pregnancy after one year of sexual contact without the use of any contraception. The aim of this study was to investigate the association between thickness and endometrial pattern with B-HCG test in women undergoing induction of ovulation who referring to infertility clinic of Ali ebn Abitalib Hospital in Zahedan (southern province of Iran). Materials and methods: This cross-sectional study was conducted in 2017 at Ali ebn Abitaleb Hospital in Zahedan (Iran). The thickness and endometrial pattern were determined using transvaginal sonography and the pregnancy rate was determined based on BHCG test. Data were analyzed by SPSS version 22 using Chi-Square and Independent T-test. Results: In this study, 200 individuals with mean age of 29.6 ± 5.6 years were studied. The negative or positive BHCG distribution was significantly different in terms of endometrial pattern (P = 0.001), so that in the three line pattern of endometrial thickness, 35.3% had BHCG positive cases, while in homogenous pattern, 3/3% had BHCG positive cases . Pregnancy rate in women with endometrial thickness greater than 7 mm was significantly higher than those who were less than 7 mm thickness (35.1% vs. 12.8%; P <0.001). Conclusion: Overall, the results of this study showed that there was a significant relationship between the endometrial pattern and its thickness and pregnancy rate based on the positive BHCG test.
