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LDH activity was found to be elevated in severe pre\u2010eclampsia and in chronic hypertensive women during pregnancy, as well as during normal and dysfunctional labor. No change was established in total serum LDH during normal pregnancy.<\/jats:p><jats:p>LDH 1 was increased during late pregnancy and at term. In severe pre\u2010eclampsia and during normal labor it was decreased. LDH 2 was also decreased in severe pre\u2010eclampsia and during dysfunctional labor. LDH 3 was decreased during late pregnancy but increased in severe pre\u2010eclampsia. No change was observed in LDH 4 during pregnancy, or in labor. 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