الفهرس 
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Abstract
Spontaneous abortion is considered a main reproductive health issue acts as a health risk factor for mother’s welfare and threatened their lives. It is the most common type of pregnancy loss. The probability of spontaneous abortion increased when multiple risk factors were present such as genetic disorders, microbial infection and deformities and congenital malformations of the uterus & etc. However, it is thought that women can avoid spontaneous abortion by many behaviors such as preconception care, prenatal behaviors and antenatal care.