Within the time span of 26 weeks (28 weeks after the LPM) a termination of a pregnancy is called an abortion. One distinguishes between:
- Early abortion up to the 14th week (16th week after the LPM)
- Late abortion: 15th to 26th week (17th - 28th week after LPM)
Data concerning the frequency of miscarriages can only be made with some certainty for spontaneous abortions that are perceived and reported. Such abortions cause the woman, as long as she knew she was pregnant, to visit the doctor. The available statistics agree that abortions amount to roughly 10% of the birth rate. However, the real number of such abortions will never be precisely known for two reasons: Firstly, when the woman was not aware she was pregnant, very early miscarriages proceed as if they were delayed menstrual bleeding. The second reason is that artificially induced abortions are often not recognized as such
One distinguishes various causes for spontaneous abortions:
- Maternal causes (e.g., a uterine tumor)
- Fetoplacental causes (e.g., nidation anomalies such as placenta previa)
- Spermatogenic causes (e.g., Sperm cell anomalies)
- Iatrogenic causes (e.g., medications)
An early abortion makes itself known through uterine contractions, bleeding, and/or loss of tissue. Late abortions are preceded by a rupture of the fetal membranes and its contents are expulsed with bleeding.
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