While being thought that 15%-20% of the pregnancies result in abortion, because of the fact that women, in general, are not aware of abortions  in the early stages of pregnancy or evaluate it as deviated menstrual, This ratio is probably more than that of being thought.

There are some reasons for abortions. The reasons are chromosomal, endocrinological, anatomic, autoimmune, exogen.

One the most important reasons of them fetal chromosome anomalies are responsible for 50%-60% in the first trimester, 20%-25% in the second trimester, 5%-10% of the third trimester of abortions. These anomalies found at fetus are generally newly occurred events and thus there is very much less of the risk of recurrent the successive pregnancies.

But at some couples even if the parents are healthy, it can also be found some irregularities causing abortions. It is strongly recommended that chromosome analysis be conducted on the blood samples taken both the cell of aborted fetus, and couples suffering abortions (two times or more). At this genetic explorations if it is found that there is no a chromosome anomaly, The other factors causing abortions need to be evaluated by a gynaecologist.