Objective: Abortus imminens is a critical complication observed 10-20% of all pregnant women. Subchorionic hematoma is an important parameter in the diagnosis of abortus imminens; however, it is yet to be known the exact cause of subchorionic hematoma. A relation is thought to exist between anti-cardiolipin antibodies and subchorionic hematoma. So, we hereby in this study have compared the positiveness of the anti-cardiolipin antibodies in women with and without subchorionic hematoma. We have as well examined whether there is a relation between pregnancy outcomes and anti-cardiolipin positiveness.