Received September 08, 2021
Accepted March 29, 2022

ABSTRACT Purpose: Monozygotic twin (MZT) pregnancies increase the risk of maternal and infant mortality and reveal many complications. In the present study, we aimed to share our assisted reproductive techniques (ART) through the analysis of perinatal outcomes in MZT pregnancies. Materials and Methods: In this retrospective clinical cross-sectional study, 1159 cycles in the In vitro fertilization (IVF) program between October 2014 and December 2019 were retrospectively evaluated and perinatal outcomes and general clinical conditions were analyzed. Results: 16 cycles with MZT were achieved with IVF, resulting in a MZT incidence of 1.38%. The MZT incidence aged≤35 and >35 years were 0.2% and 1.1%, respectively. Eight MZT pregnancies resulted in a live birth, while 5 MZT resulted in an abortus. A significant positive correlation was found between the number of trials and the age of female (r:0.674; p=0.004) and male (r:0.657; p=0.006). Cumulus-Oocytes Complexes (COC) (r:0,635; p=0,008), Metaphase II Oocyte (MIIO) (r:0,627; p=0,009), Pronucleus Oocyte (PO) (r:0,585; p=0,017) were correlated with serum AMH levels. Number of MZT was positively correlated with the male age (r:0,527; p=0,036), while negatively correlated with embryo transfer day (ETd) (r: -0,548; p=0,028). Conclusion: The pregnancies that we identified and achieved with IVF had a similar incidence of MZT with the literature, although its risk was more for women >35 years. MZT pregnancies can become a problem as the increasing number of IVF applications continue due to its potential risks for both maternal and fetus.