Abstract
Threatened abortion is the most frequently encountered complication in early human pregnancy. The exact incidence is unknown, but an incidence of vaginal bleeding before the 28th week of pregnancy of 16% has been reported (South and Naldrett, 1973). The study, however, only included singleton pregnancies carried beyond the 28th week and not pregnancies with vaginal bleeding ending in spontaneous abortion. With reference to incidences of spontaneous abortion from about 27–28% (Stickle,1968; Hertig, 1975) to 43% (Miller et al., 1980) an estimated incidence of 20–30% of all pregnancies recognized clinically and/or biochemically seems reasonable.
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Hertz, J.B. (1984). Predictive value of hormone measurements in threatened abortion. In: Hafez, E.S.E. (eds) Spontaneous Abortion. Advances in Reproductive Health Care, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9789-5_22
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DOI: https://doi.org/10.1007/978-94-010-9789-5_22
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