History and Objectives: Due to the importance of and different factors related to failure of pregnancy and since little is known about failure of pregnancy in Kashan, the present study was carried out in order to determine prevalence and factors related to failure of pregnancy in Dr. Shabihkhani hospital in Kashan in 1998.

Materials and Methods: A descriptive study concerning 1077 pregnant women and failure of pregnancy including abortion and fetal death and its relationship with maternal age, paternal age, parity and previous abortion was carried out.

Results: The prevalence of failure of pregnancy, abortion and fetal death was 13.8%, 11.4% and 2.4% respectively. High maternal age was the most prevalent factor involved with abortion (21.8% with the age of 40 or older and 10% with age group of 20-30). The prevalence of abortion and fetal death was increased with maternal age, paternal age, previous history of pregnancies (>6 time) and previous abortion.

Conclusion: The parental age in the time of pregnancy, previous abortions and parity were significant factors in failure of pregnancy. Further studies on the factors related to failure of pregnancy are recommended.