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The authors investigated within the framework of non-specific immunity reactions proteins of the acute phase during spontaneous delivery and Caesarean section up to the 5th day after delivery and on the 1st, 5th and 10th day after delivery in forty women, half of them healthy and half suffering from late gestoses. Half the women had spontaneous deliveries, half had deliveries by Caesarean section. The proteins of the acute phase reacted sensitively to the stress of childbirth during spontaneous delivery and their activation was inhibited by general anaesthesia in deliveries by Caesarean section. After spontaneous delivery the elevated proteins of the acute phase returned to baseline values by the 5th day, after operation their levels rose further up to the 5th day, orosomucoid to the 10th day after operation. In late gestoses with spontaneous delivery or by Caesarean section there were significantly elevated alpha-1-antitrypsin and alpha-2-macroglobulin and orosomucoid levels, whole in patients with late gestoses in the prealbumin levels were reduced. The elevated levels of proteinase inhibitors in late gestoses support the view on a possibly impaired coagulation equilibrium in late gestoses, and the high ceruloplasmin levels suggest an enhanced catecholamine breakdown during the stress alarm reaction.