Abortion is the termination of a pregnancy by the removal or expulsion of a fetus or embryo from the uterus, resulting in or caused by its death. Missed abortion is the most common dangerous condition in pregnancy. An abortion can occur due to maternal complications, chronic disease, endocrine disorders, abortificient drugs, radiation, heavy metals and toxins. The study population consisted of 43 aborted patients and 43 normal pregnant females, referred to Imam Khomeini hospital. 10 mL blood

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... taken and centrifuged to isolate the patients' serum. Then, the samples were analyzed to determine the copper and selenium levels, using atomic absorption spectrometry. All data were statistically analyzed by T-test and Mann-Whitney methods. As a result, we found a significant decrease in serum copper level in cases compared with controls. Also the results showed an insignificant decrease in serum selenium levels in the patients compared to the healthy women. According to the results, deficiency of the essential heavy metals may be a probable reason for missed abortion occurrence. These deficiencies can be related to malnutrition, decreased consumption of essential metals and supplementary compounds in pregnancy, lack of regular laboratory monitoring. Thus, consuming supplements in Iranian pregnant women can be helpful in completing a successful pregnancy.