Miscarriage
A miscarriage is the spontaneous loss of a pregnancy from conception to 20 weeks' gestation. The term stillbirth refers to the death of a fetus after 20 weeks gestation. Miscarriage is very common. As many or even most miscarriages occur so early in pregnancy that a woman does not even realize that she is pregnant, it is difficult to estimate how frequently miscarriages occur. Some experts believe that about half of all fertilized eggs die before implantation or are miscarried. Of known pregnancies (in which a woman misses a period or has a positive pregnancy test), about 10% to 20% end in miscarriage. Risk factors for miscarriage include an older parent, previous miscarriage, exposure to tobacco smoke, obesity, diabetes, thyroid problems, and drug or alcohol use. About 80% of miscarriages occur in the first 12 weeks of pregnancy (the first trimester). The underlying cause in about half of cases involves chromosomal abnormalities.
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