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[Reference values in pregnancy].

The body of pregnant women demonstrates in many ways different functions compared to non pregnant women. In order to assess lab results of antenatal tests the knowledge of physiologic and pathophysiologic changes are essential. This article reviews the state of the art in terms of reference values during pregnancy enriched with own results. Of special value for the practitioner are such reference values and curves for the circulatory system, kidney function, hematologic changes, plasma components and weight gain.