[Longitudinal study of the blood protein concentration during normal pregnancy, at the time of delivery and on the 7th post-partum day].

The concentration of serum protein was determined in 227 women during the 11th to 13th, 24th to 26th and 33rd to 35th week of pregnancy as well as immediately after delivery and on the 7th day post partum according to the Biuret method. A small but significant decrease of protein was observed during the second trimester of pregnancy (Ist Trimester x(-) = 7,57; IInd Trimester x(-) = 7,26 g/100 ml). The lowest values was found immediately after delivery (x(-) = 6,86). The mean concentration on the 7th day post partum was increased again (x(-) = 7,37). The values were compared with there of 190 non-pregnant women (x(-) = 7,57).