Abstract: Background and Objective: Missed abortion is a failed pregnancy due to the death of the embryo conception product or a fetus. This research aims to identify the correlation between fibrinogen level on pregnancy and the age of the conception product during abortion, abortion progress and appearance of placental infarct on missed abortion cases. Materials and Methods: The research method used is a cross sectional analysis. The study was done in Budi Mulia Maternal Hospital and Network Hospital in Makassar city. The study sample is patient with early pregnancy, whom after the researchers do anamnesis, physical examination, supporting examination (blood fibrinogen level and ultrasonography) showed the potential for missed abortion, the sampling was done since March, 2017. The data was analyzed using version 17.0 of SPSS. Results: The study resulted that there were significant increases of fibrinogen (p = 0.015) on missed abortion during 6th-10th week pregnancy, that had been measured since the beginning of the last menstruation period and on fibrinogen level increased on early pregnancy according to the ultrasonography (64.3%) (p = 0.007). Conclusion: The abnormally elevated pregnancy fibrinogen concentration during abortion age is equivalent to hypercoagulation that has potential on abnormal hyper coagulability, tend to create thrombosis.