Chromosomal abnormalities are causative in approximately 50 percent of spontaneous abortions multiple other factors also may play a role. Ultrasonography is helpful in the diagnosis of spontaneous abortion, but other testing may be needed if an ectopic pregnancy cannot be ruled out. Spontaneous abortion can be subdivided into threatened abortion, inevitable abortion, incomplete abortion, missed abortion, septic abortion, complete abortion, and recurrent spontaneous abortion. Spontaneous abortion, which is the loss of a pregnancy without outside intervention before 20 weeks’ gestation, affects up to 20 percent of recognized pregnancies.
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