70 chorion biopsies (CB) were studied morphologically under the conditions of a spontaneous abortion. Within the first trimester of the pregnancy the diagnosis of progressing, regressing and non-perspective pregnancy proved possible. The comparison of the histological examination of biopsies, endometrium scrapes and placenta with clinico-biochemical results indicates an important diagnostical and prognostical value of CB helpful in choosing corrective therapy for conservation of the pregnancy under a favourable prognosis.
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