Abstract
The normal ranges of variation of the acute phase reactants α1-antitrypsin, orosomucoid, haptoglobins and ceruloplasmin in maternal and fetal sera at delivery are given. The results suggest that rate of synthesis of α1-antitrypsin and orosomucoid calculated accord ing to bodyweight, is at least twice as high in the mother as in the fetus. The corresponding ratio for the other two proteins was still higher.