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Spontaneous Abortion
D efinition — Unavoidable loss of viability in the first 12 weeks.
Clinical Features
Epidemiology
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Approximately one third of clinically known pregnancies terminate in the first 12 weeks.
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Forty to fifty percent have a chromosomal anomaly.
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Twenty percent have trisomy aneuploidies, and 6% are triploid.
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The risk of a chromosomal abnormality increases with multiple losses.
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